Battle of Chochiwon
The Battle of Chochiwon was an early engagement between United States and North Korean forces during the Korean War, taking place in the villages of Chonui and Chochiwon in western South Korea on July 10–12, 1950. After three days of intense fighting, the battle ended in a North Korean victory; the United States Army's 21st Infantry Regiment, 24th Infantry Division was assigned to delay two advancing North Korean People's Army divisions following communist victories at Osan and Chonan earlier in the month. The regiment deployed along roads and railroads in between the two villages, attempting to slow the advance as much as possible. Aided by air strikes, U. S. Army units were able to inflict substantial damage on the North Korean armor and other vehicles, but were overwhelmed by North Korean infantry; the two understrength U. S. battalions fought in several engagements over the three-day period and suffered massive losses in personnel and equipment, but were able to delay the North Korean forces for several days, allowing the remainder of the 24th Infantry Division to set up blocking positions along the Kum River near the city of Taejon.
On the night of June 25, 1950, 10 divisions of the North Korean People's Army launched a full-scale invasion on the nation's neighbor to the south, the Republic of Korea. Advancing with 89,000 men in six columns, the North Koreans caught the South Korean Army by surprise, resulting in a disastrous rout for the South Koreans who were disorganized, ill-equipped, unprepared for war. Numerically superior, North Korean forces destroyed isolated resistance, pushing down the peninsula against the South Koreans who could muster just 38,000 men to the front-line to oppose them; the majority of the South Korean forces retreated in the face of the invasion, by June 28 the North Koreans had captured the capital Seoul, forced the government and its shattered forces to withdraw further southwards. Meanwhile, the United Nations Security Council voted to send assistance to the collapsing country and United States President Harry S. Truman subsequently ordered ground troops into the nation. However, U. S. forces in the Far East had been decreasing since the end of World War II, five years earlier.
At the time, the closest force was the 24th Infantry Division of the Eighth United States Army, stationed in Japan under the command of William F. Dean. Tellingly, the division was under strength and most of its equipment was antiquated due to reductions in military spending, yet in spite of these deficiencies the division was ordered into South Korea, tasked with taking the initial "shock" of the North Korean advances until the rest of the Eighth Army could arrive and establish a defense. The plan was to airlift one battalion of the 24th Infantry Division into South Korea via C-54 Skymaster transport aircraft and block advancing North Korean forces while the remainder of the division was transported on ships; the 21st Infantry Regiment was identified as the most combat-ready of the 24th Infantry Division's three regiments, the 21st Infantry's 1st Battalion was selected because its commander, Lieutenant Colonel Charles B. Smith, was the most experienced, having commanded a battalion at the Battle of Guadalcanal during World War II.
On July 5, Task Force Smith engaged North Korean forces at the Battle of Osan, delaying over 5,000 North Korean infantry for seven hours before being routed and forced back. During that time, the U. S. 34th Infantry Regiment set up a line between the villages of Pyongtaek and Ansong, 10 miles south of Osan, to fight the next delaying action against the advancing North Korean forces. The 34th Infantry Regiment was unprepared for a fight; the 1st Battalion, left alone against the North Koreans resisted their advance in the brief and disastrous Battle of Pyongtaek. The 34th Infantry was unable to stop North Korean armor. After a 30-minute fight, the 34th mounted a disorganized retreat in which many soldiers abandoned equipment and retreated without resisting the North Korean forces; the Pyongtaek—Ansong line was unable to delay the North Korean force or inflict heavy casualties on them. The regiment subsequently retreated to Chonan, the next night the 3rd Battalion was engaged in another delaying action.
The 34th Infantry lost its commander, Colonel Robert R. Martin as well as two thirds of its 3rd Battalion's strength; the exhausted 34th Infantry Regiment retreated to the Kum River, near the 24th Infantry Division's headquarters. The 24th Infantry Division would make one final delaying action before it would be forced to make its final stand around Taejon, the only major defensible city left before the Pusan Perimeter being established by the Eighth Army. Having pushed back U. S. forces at Osan and Chonan, the North Korean 4th Infantry Division, supported by elements of the 105th Armored Division, continued its advance down the Osan—Chonan road, up to 12,000 men strong under division commander Lee Kwon Mu in two infantry regiments supported by dozens of tanks. Behind it, the North Korean 3rd Infantry Division had yet to engage the American forces. By July 7, the 21st Infantry Regiment had been established at Chochiwon, one of two roads to the Kum River and Taejon; the regiment was ordered to keep the road through the region open so supplies and ammunition could flow through it to the 34th Infantry Regiment on the front lines.
The Americans spent several days unloading supplies from locomotives in the village. After blowing up all bridges north of the town, 1st Battalion was established on the Chochiwon road at Chonui, 12 miles south of Chonan. Supporting it were one battery of 155-mm howitzers from the 11th Field Artillery Battalion and A Company of t
Battle of the Bowling Alley
In the Battle of the Bowling Alley, United Nations forces defeated North Korean forces early in the Korean War near the city of Taegu, South Korea. The battle took place in a narrow valley, dubbed the "Bowling Alley", north of Taegu, it followed a week of fighting between the Korean People's Army 13th Division and the Republic of Korea Army's 1st Division along the latter's last defensible line in the hills north of the city. Reinforcements, including the US Army's 27th and 23rd Infantry Regiments were committed to bolster the South Koreans' defenses; this battle and several others were smaller engagements of the Battle of Pusan Perimeter. For another week, North Korean divisions launched all the troops they had in massed attacks against the ROK and US lines, their attacks, which occurred at night and were supported by armor and artillery, advanced with infantry and tanks in close support of one another. Each North Korean attack ran into well-established UN lines, where US tanks and entrenched infantry were positioned to counter them.
Strikes by US aircraft ravaged the attacking North Koreans. The fighting was fierce with many casualties on both sides where the North and South Koreans fought one another; the repeated attacks broke and pushed back the North Korean forces. They continued their push against the Pusan Perimeter until they were outflanked in the Battle of Inchon. Following the invasion of the South Korea by North Korea on June 25, 1950, the UN voted to use force to defend South Korea; the United States, a member of the UN committed ground forces to the Korean peninsula with the goal of pushing back the North Korean invasion and preventing South Korea from collapsing. But US forces in the Far East had been decreasing since the end of World War II, five years earlier, at the time the closest force was the 24th Infantry Division, headquartered in Japan; the division was understrength, most of its equipment was antiquated due to reductions in military spending. The 24th was ordered to South Korea; the 24th Infantry Division was the first US unit sent into Korea with the mission to take the initial "shock" of North Korean advances, delaying much larger North Korean units to buy time to allow reinforcements to arrive.
The division fought for several weeks while the 1st Cavalry, 7th Infantry and 25th Infantry Divisions and Eighth United States Army supporting units were arriving. Advance elements of the 24th were badly defeated in the Battle of Osan on July 5, the first encounter between American and North Korean forces. For the first month after the defeat at Osan, the 24th Infantry Division was defeated and forced south by superior North Korean numbers and equipment; the regiments of the division were systematically pushed south in engagements around Chochiwon and Pyongtaek. The 24th was annihilated in the Battle of Taejon, but was able to delay the North Korean forces until July 20. By that time, the Eighth Army's force of combat troops were equal to North Korean forces attacking the region, with new UN units arriving every day. After the fight at Taejon, UN forces were pushed back before halting the North Korean advance in a series of engagements in the southern section of the country. Forces of the 3rd Battalion, 29th Infantry, newly arrived in the country, were wiped out at Hadong in a coordinated ambush by North Korean forces on July 27, opening a pass to the Pusan area from the west.
Soon after, North Korean forces took Chinju, east of Hadong, pushing back the US 19th Infantry Regiment and leaving routes to Pusan open to direct North Korean attacks. The UN formations were subsequently able to defeat the North Koreans in the Battle of the Notch on August 2, halting their advance from the west. Suffering mounting losses, the KPA force withdrew for several days to re-equip and receive reinforcements; this granted both sides a reprieve to prepare for the attack on the Pusan Perimeter. Meanwhile, the Eighth Army commander Lieutenant General Walton Walker had established Taegu as his headquarters. At the center of the Pusan Perimeter line, Taegu stood at the entrance to the Naktong River valley, an area where North Korean forces could advance in large numbers in close support; the natural barriers provided by the Naktong River to the south and the mountainous terrain to the north converged around Taegu, a transportation hub and the last major South Korean city aside from Pusan itself to remain in UN hands.
From south to north, the city was defended by the US 1st Cavalry Division, the ROK 1st Division and the 6th Division, which were under the command of ROK II Corps. The 1st Cavalry Division was spread out along a long line on the Naktong River to the south, with its 5th Cavalry and 8th Cavalry regiments holding a 24,000-meter line along the river south of Waegwan, facing west; the 7th Cavalry held position to the east in reserve, along with artillery forces, ready to reinforce anywhere a North Korean crossing could be attempted. The ROK 1st Division held a northwest-facing line in the mountains north of the city while the ROK 6th Division held position to the east, guarding the narrow valley holding the Kunwi road into the Pusan Perimeter area. Five North Korean divisions amassed around Taegu to oppose the UN forces in the city. From south to north, the 10th, 3rd, 15th, 13th, 1st North Korean Divisions occupied a wide line encircling Taegu from Tuksong-dong and around Waegwan to Kunwi; the North Korean army planned to use the natural corridor of the Naktong River valley from Sangju to Taegu as its main axis of attack for the next push south, so the KPA divisions all moved through this valley, crossing the Naktong at different areas along the low ground.
Battle of Hwanggan
The Battle of Hwanggan was an engagement between United States and North Korean forces that took place on July 23–29, 1950, on a road north of the village of Hwanggan in southern South Korea, early in the Korean War. The battle ended in a victory for the North Koreans; the US Army's 27th Infantry Regiment, 25th Infantry Division, newly arrived in Korea, was moved to a road north of Hwanggan to block the North Korean Korean People's Army's 2nd Division, advancing following the Battle of Taejon. In an unusually good first performance, the 27th Infantry was able to delay the North Korean division for a week, inflicting heavy casualties on it while suffering few casualties of their own; the North Koreans were able to overwhelm the US forces with sheer numbers, capturing Hwanggan and pushing the American units further south. However, the action solidified the 27th Infantry's position as a valuable reserve unit for the US Eighth Army during the Battle of Pusan Perimeter; the 27th distinguished itself in several critical battles, including the Battle of the Bowling Alley.
Following the invasion of South Korea by North Korea, the subsequent outbreak of the Korean War, the United Nations decided to commit troops to the conflict on behalf of South Korea. The United States sent ground forces to the Korean peninsula with the goal of fighting back the North Korean invasion and to prevent South Korea from collapsing. However, US forces in the Far East had been decreasing since the end of World War II in 1945, at the time the closest forces were the 24th Infantry Division of the Eighth Army, headquartered in Japan; the division was understrength, most of its equipment was antiquated due to reductions in military spending. Regardless, the 24th Infantry Division was ordered into South Korea; the 24th Infantry Division was the first US unit sent into Korea with the mission to take the initial "shock" of North Korean advances, delaying much larger North Korean units to buy time to allow follow-on forces to arrive. The division was outnumbered and outgunned for several weeks as it attempted to delay the North Koreans, making time for the 7th Infantry Division, 25th Infantry Division, 1st Cavalry Division and other Eighth Army supporting units to move into position.
Republic of Korea Army forces in the meantime were systematically defeated and forced south along Korea's east coast, with entire divisions being overrun by the KPA' superior firepower and equipment. Advance elements of the 24th Infantry Division were badly defeated in the Battle of Osan on July 5, during the first battle between American and North Korean forces. For the first month after the defeat of Task Force Smith, 24th Infantry Division soldiers were defeated and forced south by the KPA's superior numbers and equipment; the regiments of the 24th Infantry Division were systematically pushed south in battles around Chochiwon and Pyongtaek. The 24th Infantry Division made a final stand in the Battle of Taejon, being completely destroyed in the process but delaying North Korean forces from advancing until July 20. By that time, the Eighth Army's force of combat troops was equal to North Korean forces attacking the region at around 70,000 for each side, with new UN units arriving every day.
In the east, the North Koreans advanced after taking Taejon. Four North Korean divisions approached the UN lines along separate routes; the KPA 15th Division was the first to move against the US 25th Infantry Division in the Battle of Sangju on July 20, where the division's US 24th Infantry would be pushed back by the North Korean advance. In the meantime, the KPA 3rd Division engaged the newly arrived US 1st Cavalry at the Battle of Yongdong on July 22, where that division would perform poorly; the KPA 6th Division moved further south, where it would confront the US 29th Infantry Regiment at the Hadong Ambush on July 27 destroying one of the regiment's battalions. The US units were performing poorly in their first engagements against North Korean units, as a combination of shortages of supplies and lack of experienced soldiers and officers plagued the UN forces at this stage of the war; as other North Korean forces were closing on Yongdong, the KPA 2nd Division continued its advance down the road from Hwanggan to Poun, having arrived in Taejon too late for the fight there.
Its orders were to pass through that town and come out on the main Seoul–Pusan highway at Hwanggan, about 10 miles east of Yongdong, placing it in the rear of the 1st Cavalry Division and on its main supply road. Responding to the threat, the Eighth Army ordered the US 27th Infantry Regiment, 25th Infantry Division to block the advance. After arriving in Korea, the regiment went to the Uisong area, 35 miles north of Taegu. On July 13, it moved from there to Andong to support ROK troops, but before it entered action in the fight in that city, it received orders to move to Sangju to assist the 25th Infantry Division's other two regiments in that battle. En route, it received still other orders to change its destination to Hwanggan, it closed there in an assembly area on the night of July 22–23; the 27th Infantry's mission at Hwanggan was to relieve the exhausted and decimated ROK units retreating down the Poun road. In the meantime it lost large numbers of its experienced officers as they were shifted to the US 24th Infantry.
In carrying out Eighth Army's orders to block the Poun road, regimental commander Colonel John H. Michaelis, a West Point graduate known as an effective commander, assigned the 1st Battalion, 27th Infantry, to make contact with the first North Korean attacks. On the morning of July 23, Lieutenant Colonel Gilbert J. Check moved the
The Korean War was a war between North Korea and South Korea. The war began on 25 June 1950 when North Korea invaded South Korea following a series of clashes along the border; as a product of the Cold War between the Soviet Union and the United States, Korea had been split into two sovereign states in 1948. A socialist state was established in the north under the communist leadership of Kim Il-sung and a capitalist state in the south under the anti-communist leadership of Syngman Rhee. Both governments of the two new Korean states claimed to be the sole legitimate government of all of Korea, neither accepted the border as permanent; the conflict escalated into warfare when North Korean military forces—supported by the Soviet Union and China—crossed the border and advanced south into South Korea on 25 June 1950. The United Nations Security Council authorized the formation and dispatch of UN forces to Korea to repel what was recognized as a North Korean invasion. Twenty-one countries of the United Nations contributed to the UN force, with the United States providing around 90% of the military personnel.
After the first two months of war, South Korean and U. S. forces dispatched to Korea were on the point of defeat, forced back to a small area in the south known as the Pusan Perimeter. In September 1950, an amphibious UN counter-offensive was launched at Incheon, cut off many North Korean troops; those who escaped envelopment and capture were forced back north. UN forces approached the Yalu River—the border with China—but in October 1950, mass Chinese forces crossed the Yalu and entered the war; the surprise Chinese intervention triggered a retreat of UN forces which continued until mid-1951. In these reversals of fortune, Seoul changed hands four times, the last two years of fighting became a war of attrition, with the front line close to the 38th parallel; the war in the air, was never a stalemate. North Korea was subject to a massive bombing campaign. Jet fighters confronted each other in air-to-air combat for the first time in history, Soviet pilots covertly flew in defense of their communist allies.
The fighting ended on 27 July 1953. The agreement created the Korean Demilitarized Zone to separate North and South Korea, allowed the return of prisoners. However, no peace treaty was signed, according to some sources the two Koreas are technically still at war, engaged in a frozen conflict. In April 2018, the leaders of North and South Korea met at the demilitarized zone and agreed to work towards a treaty to formally end the Korean War. In South Korea, the war is referred to as "625" or the "6–2–5 Upheaval", reflecting the date of its commencement on June 25. In North Korea, the war is referred to as the "Fatherland Liberation War" or alternatively the "Chosǒn War". In China, the war is called the "War to Resist America and Aid Korea", although the term "Chaoxian War" is used in unofficial contexts, along with the term "Hán War" more used in regions such as Hong Kong and Macau. In the U. S. the war was described by President Harry S. Truman as a "police action" as the United States never formally declared war on its opponents and the operation was conducted under the auspices of the United Nations.
It has been referred to in the English-speaking world as "The Forgotten War" or "The Unknown War" because of the lack of public attention it received both during and after the war, in relation to the global scale of World War II, which preceded it, the subsequent angst of the Vietnam War, which succeeded it. Imperial Japan destroyed the influence of China over Korea in the First Sino-Japanese War, ushering in the short-lived Korean Empire. A decade after defeating Imperial Russia in the Russo-Japanese War, Japan made Korea its protectorate with the Eulsa Treaty in 1905 annexed it with the Japan–Korea Annexation Treaty in 1910. Many Korean nationalists fled the country; the Provisional Government of the Republic of Korea was founded in 1919 in Nationalist China. It failed to achieve international recognition, failed to unite nationalist groups, had a fractious relationship with its U. S.-based founding president, Syngman Rhee. From 1919 to 1925 and beyond, Korean communists led internal and external warfare against the Japanese.
In China, the Nationalist National Revolutionary Army and the communist People's Liberation Army helped organize Korean refugees against the Japanese military, which had occupied parts of China. The Nationalist-backed Koreans, led by Yi Pom-Sok, fought in the Burma Campaign; the communists, led by Kim Il-sung among others, fought the Japanese in Manchuria. At the Cairo Conference in November 1943, the United Kingdom, the United States all decided that "in due course Korea shall become free and independent". At the Tehran Conference in November 1943 and the Yalta Conference in February 1945, the Soviet Union promised to join its allies in the Pacific War within three months of the victory in Europe. Accordingly, it declared war o
Battle of Chumonchin Chan
The Battle of Chumonchin Chan or the Action of 2 July 1950 was the battle fought between surface combatants during the main phase of the Korean War. It began. On 2 July 1950, USS Juneau, HMS Black Swan, HMS Jamaica were sailing along the coast of the Sea of Japan when they encountered four North Korean torpedo and gunboats that had just finished escorting a flotilla of ten ammunition ships up the coast; the North Korean torpedo boats began an attack on the allied ships. Before their torpedoes could be fired however, they were met with a salvo of gunfire from the United Nations ships which destroyed three of the torpedo boats; the surviving North Korean craft fled. In July, Juneau encountered the same ammunition ships and destroyed them. Naval Battles of the Korean War. Archived 2 November 2013 at the Wayback Machine
Battle of Pusan Perimeter
The Battle of Pusan Perimeter was a large-scale battle between United Nations and North Korean forces lasting from August 4 to September 18, 1950. It was one of the first major engagements of the Korean War. An army of 140,000 UN troops, having been pushed to the brink of defeat, were rallied to make a final stand against the invading North Korean army, 98,000 men strong. UN forces, having been defeated by the advancing North Koreans, were forced back to the "Pusan Perimeter", a 140-mile defensive line around an area on the southeastern tip of the Korean Peninsula that included the port of Pusan; the UN troops, consisting of forces from the Republic of Korea, United States and United Kingdom mounted a last stand around the perimeter, fighting off repeated North Korean attacks for six weeks as they were engaged around the cities of Taegu, P'ohang, the Naktong River. The massive North Korean assaults were unsuccessful in forcing the United Nations troops back further from the perimeter, despite two major pushes in August and September.
North Korean troops, hampered by supply shortages and massive losses, continually staged attacks on UN forces in an attempt to penetrate the perimeter and collapse the line. However, the UN used the port to amass an overwhelming advantage in troops and logistics, its navy and air forces remained unchallenged by the North Koreans during the fight. After six weeks, the North Korean force collapsed and retreated in defeat after the UN force launched a counterattack at Inchon on September 15; the battle would be the furthest the North Korean troops would advance in the war, as subsequent fighting ground the war into a stalemate. Following the outbreak of the Korean War, the United Nations decided to commit troops in support of the Republic of Korea, invaded by the neighboring Democratic People's Republic of Korea; the United States subsequently sent ground forces to the Korean peninsula with the goal of fighting back the North Korean invasion and to prevent South Korea from collapsing. However, US forces in the Far East had been decreasing since the end of World War II, five years earlier, at the time the closest forces were the 24th Infantry Division of the Eighth United States Army, headquartered in Japan.
The division was understrength, most of its equipment was antiquated due to reductions in military spending. Regardless, the 24th Infantry Division was ordered into South Korea; the Korean People's Army, 89,000 men strong, had advanced into South Korea in six columns, catching the Republic of Korea Army by surprise and routing it. The smaller ROKA suffered from widespread lack of organization and equipment, was unprepared for war. Numerically superior, KPA forces destroyed isolated resistance from the 38,000 ROKA soldiers on the front before moving south. Most of South Korea's forces retreated in the face of the advance. By June 28, the KPA had captured South Korea's capital of Seoul, forcing the government and its shattered forces to retreat further south. Though it was pushed back, South Korean forces increased their resistance further south, hoping to delay KPA units as much as possible. North and South Korean units sparred for control of several cities, inflicting heavy casualties on one another.
The ROKA defended Yongdok fiercely before being forced back, managed to repel North Korean forces in the Battle of Andong. Outnumbered and under-equipped US forces—committed in piecemeal fashion as as they could be deployed—were defeated and pushed south; the 24th Division, the first US division committed, took heavy losses in the Battle of Taejon in mid-July, which they were driven from after heavy fighting. Elements of the 3rd Battalion, 29th Infantry Regiment, newly arrived in the country, were wiped out at Hadong in a coordinated ambush by KPA forces on July 27, leaving open a pass to the Pusan area. Soon after, Chinju to the west was taken, pushing back the 19th Infantry Regiment and leaving open routes to Pusan. US units were subsequently able to defeat and push back the KPA on the flank in the Battle of the Notch on August 2. Suffering mounting losses, the KPA force on the west flank withdrew for several days to re-equip and receive reinforcements; this granted both sides several days of reprieve to prepare for the attack on the Pusan Perimeter.
The KPA forces were organized into a mechanized combined arms force of ten divisions numbering some 90,000 well-trained and well-equipped troops in July, with hundreds of T-34 tanks. However, defensive actions by US and South Korean forces had delayed the North Koreans in their invasion of South Korea, costing them 58,000 of their troops and a large number of tanks. In order to recoup these losses, the North Koreans had to rely on less-experienced replacements and conscripts, many of whom had been taken from the conquered regions of South Korea. During the course of the battle, the North Koreans raised a total of 13 infantry divisions and one armored division to the fight at Pusan Perimeter; the UN forces were organized under the command of the United States Army. The Eighth United States Army served as the headquarters component for the UN forces, was headquartered at Taegu. Under it were three weak US divisions; these forces occupied the western segment of the perimeter, along the Naktong River.
The ROKA, a force of 58,000, was organized into five divisions.
15th Infantry Regiment (United States)
The 15th United States Infantry Regiment is a parent regiment in the United States Army. It has a lineage tracing back to the American Civil War; the official Army history and lineage does not credit the current 15th Infantry with the honors or lineage of these earlier regiments. The first 15th Infantry in the U. S. Army was organized on 16 July 1798 for the "Quasi-War" with France; the regiment saw no war service and was inactivated in 1800. A second 15th Infantry was activated in 1812 in New Jersey for service in Canada during the War of 1812; the 15th fought in the capture of Toronto and Fort George in April and May 1813, covered the retreat of militia troops from Fort George in December 1813. In this retreat, no member of the 15th was captured, despite taking heavy casualties; the 15th fought in the Champlain Valley campaign in autumn 1814 at Plattsburgh, participated in General Dearborn's offensive in Ontario in October, took part in many smaller battles that same year. The regiment was eliminated in the Army reorganization of 1815.
On 11 February 1847, a new 15th Infantry was activated for service in Mexico. As companies of the 15th arrived at Vera Cruz, they moved inland to join General Winfield Scott's army advancing on Mexico City; the regiment fought in the battles of Contreras and Churubusco, as well as smaller engagements before storming the walls of Chapultepec in Mexico City. Following garrison duty in Mexico City and Cuernavaca, the regiment returned to the United States for inactivation in August 1848; the current 15th Infantry was activated during the Civil War on 3 May 1861 by General Order No. 33 with its headquarters first in Wheeling, West Virginia Cleveland, Ohio on to Newport Barracks and ending up in Fort Adams, Rhode Island. At the Battle of Shiloh on 7 April 1862, the 15th Infantry was the first new infantry regiment to engage in battle in the Civil War. In April–May 1862, the regiment marched toward and fought in the First Battle of Corinth, Mississippi. By the end of the Civil War, the regiment had fought in 22 major engagements, including Chattanooga, Chickamauga and Atlanta as a part of BG King's Brigade of Johnson's Division, XIV Army Corps of the Army of the Cumberland.
The regiment was a key element of the only regular brigade in Sherman's Army. The regiment's crest includes the acorn, the symbol of the Major General George Thomas's XIV Corps, the mountains of stone to symbolize the corps' firm stand as the "Rock of Chickamauga"; the four acorns represent the four major engagements. Following the Civil War, the 15th Infantry served on occupation duty in Alabama until 1869; the regiment redeployed to the West, serving in Missouri, New Mexico, the Dakotas, Colorado. The regiment remained in New Mexico for a little over 12 years. At the end of that time, the headquarters and six companies were sent to Colorado. In 1879 and 1880 the regiment was involved in operations against the Mimbres Apaches under the warrior Victorio in New Mexico and received a campaign streamer for those operations. In October and November 1882, the regiment was transferred to the Department of Dakota: Headquarters, A, C, D, H Companies took station at Fort Randall, South Dakota; the 15th participated in campaigns against the Ute Tribe of Colorado and against the Mescalero Apaches.
In May 1890, four companies proceeded to new posts in the Department of the East: A and G Companies moved to Mount Vernon Barracks, Alabama. In July 1890 Companies I and K were skeletonized. In July, the headquarters and the five companies remaining in the Department of Dakota were assigned to Fort Sheridan, Illinois. In August, Companies E and H proceeded to Fort Sheridan; the regimental headquarters moved to Fort Sheridan in January 1891. The remaining companies from Dakota and the companies serving in the South completed their moves in May 1891; the final reconsolidation of all 15th Infantry companies after 12 years of being scattered throughout the West and South was concluded on 29 May 1891. While at Fort Sheridan the regiment played a vital role in containing the Chicago Railway Riots in July 1894; the regiment remained as part of the Department of the Missouri until 15 October 1896 served in the Department of Colorado from 19 October 1896 to 6 October 1898. With the outbreak of the Spanish–American War in 1898, the regiment moved to Huntsville, Alabama, on 12 October for intensive training.
On 27 November 1898, it sailed from Savannah, Georgia for Nuevitas, for occupation duty. On 5 January 1900, the regiment sailed home to be posted throughout upper New York State and Vermont; the regimental headquarters and First Battalion arrived in San Francisco on 16 July 1900. They boarded the Transport Sumner and sailed for Nagasaki, Japan on 17 July. In July, Companies I, K, L left their stations for San Francisco and went into camp at the Presidio. M Company came from Fort McPherson at the same time; the First Battalion arrived at Nagasaki on 10 August. There they transferred to the Transport Indiana, sailed for Tientsin via Taku on 13 August; the battalion arrived off of the Taku forts on 16 August. During the latter part of the month, the Battalion reconnoitered and skirmished continuously over the same terrain where the 9th Infantry had lost 100 men killed in action. Despite the fact that the Boxers had been dispersed several mon