"The Meuse-Argonne Offensive was a part of the final Allied offensive of World War I, writes the US National Archives introduction to their collection. "It was one of the attacks that brought an end to the War and was fought from September 26 – November 11, 1918, when the Armistice was signed.
"The Meuse-Argonne Offensive was the largest operation of the American Expeditionary Forces (AEF) in World War I, with over a million American soldiers participating. It was also the deadliest campaign in American history, resulting in over 26,000 soldiers being killed in action (KIA). Indeed, the number of graves in the American military cemetery at Romagne is far larger than those in the more commonly known site at Omaha Beach in Normandy. The Meuse-Argonne Offensive was a part of the final Allied offensive of World War I. It was one of the attacks that brought an end to the War and was fought from September 26 – November 11, 1918, when the Armistice was signed.
The Meuse-Argonne Offensive was the largest operations of the American Expeditionary Forces (AEF) in World War I, with over a million American soldiers participating. It was also the deadliest campaign in American history, resulting in over 26,000 soldiers being killed in action (KIA). Indeed, the number of graves in the American military cemetery at Romagne is far larger than those in the more commonly known site at Omaha Beach in Normandy."
https://www.archives.gov/research/military/ww1/meuse-argonne.html