Soldiers of Headquarters Company, 23rd Infantry Regiment (2nd Infantry Division) firing a 37mm gun during the Meuse-Argonne offensive, or the battle of the Argonne forest. Here, the American soldiers fought their most difficult battle in World War I. This whole offensive was planed by Marshall Ferdinand Foch with the intention of forcing the Germans to capitulate by breaching the Hindenburg line. It lasted between September 26 and November 11, 1918. Here, the Browning Automatic Rifle was first used in combat, in fact, it was popular among both US and French troops.