Alvin Cullum York, also known by his rank as Sergeant York, was an American soldier who was one of the most decorated United States Army soldiers of World War I. He received the Medal of Honor for leading an attack on a German machine gun nest, gathering 35 machine guns, killing at least 25 enemy soldiers and capturing 132 prisoners. York's Medal of Honor action occurred during the United States-led portion of the Meuse–Argonne offensive in France, which was intended to breach the Hindenburg line and force the Germans to surrender. He earned decorations from several allied countries during WWI, including France, Italy and Montenegro.

The Meuse–Argonne offensive was a major part of the final Allied offensive of World War I that stretched along the entire Western Front. It was fought from September 26, 1918, until the Armistice of November 11, 1918, a total of 47 days. The Meuse–Argonne offensive was the largest in United States military history, involving 1.2 million French, Siamese, and American soldiers. It is also the deadliest campaign in the history of the United States Army, resulting in over 350,000 casualties, including 28,000 German lives, 26,277 American lives and an unknown number of French lives. American losses were worsened by the inexperience of many of the troops, the tactics used during the early phases of the operation and the widespread onset of the global influenza outbreak called the "Spanish flu."