The Battle of Guam was the next combat assignment for 1st Battalion, 3d Marines. The amphibious assault on Guam began on July 21, 1944, with the battalion landing near Asan Point in western Guam. Once again, the battalion encountered fierce opposition and the fighting proved to be costly. Organized Japanese resistance officially ended on August 10 and Guam was declared “secured”. However, numerous Japanese remained operational in the jungle and refused to surrender. Subsequently, the battalion participated in “mopping-up” operations until it departed for Iwo Jima in February 1945.