The Meuse-Argonne Offensive (Sept. 26–Nov. 11, 1918) was the largest U.S. operation of World War I. It was also the deadliest for the American Expeditionary Forces (AEF), with 26,277 doughboys killed in action and 95,786 wounded in just 47 days of combat. Significant errors in the initial operations plan contributed to that high casualty count.
Following the September 12–15 Franco-American attack at
