Which attack took place during the Hundred Days Offensive:  Meuse-Argonne Offensive or Battle of Guam?
Meuse-Argonne Offensive:  The Meuse-Argonne Offensive was the largest in United States military history, involving 1.2 million American soldiers. Battle of Guam (1944): The Second Battle of Guam (21 July – 10 August 1944) was the American recapture of the Japanese-held island of Guam, a U.S. territory in the Mariana Islands captured by the Japanese from the U.S. in the 1941 First Battle of Guam during the Pacific campaign of World War II.
i don't know