The Mormon Battalion was the only religious unit in United States military history in federal service, recruited solely from one religious body and having a religious title as the unit designation. The volunteers served from July 1846 to July 1847 during the Mexican–American War of 1846–1848. The battalion was a volunteer unit of between 534 and 559 Latter-day Saint men, led by Mormon company officers commanded by regular U.S. Army officers. During its service, the battalion made a grueling march of nearly 1,950 miles from Council Bluffs, Iowa, to San Diego, California.

Council Bluffs is a city in and the county seat of Pottawattamie County, Iowa, United States. Its population was 62,799 as of the 2020 census, making it the state's tenth most populous city, and the most populous city in Southwest Iowa. The Omaha metropolitan region of which Council Bluffs is a part, is the 58th largest in the United States, with an estimated population of 967,604 (2020). It is located on the east bank of the Missouri River, across from Omaha, Nebraska. Until about 1853 Council Bluffs was known as Kanesville. Kanesville was the historic starting point of the Mormon Trail. Kanesville is also the northernmost anchor town of the other emigrant trails because there was a steam-powered boat which ferried the settlers' wagons and cattle across the Missouri River. In 1869, the first transcontinental railroad to California was connected to the existing U.S. rail network at Council Bluffs.