meanwhile, the unexpectedly stiff resistance on saipan and the sortie of the japanese fleet had necessitated a delay in the landings on guam. finally, as part of task group (tg) 53.3, "windsor" took part in the assault landings on guam, landing troops of the 2d battalion, 3d marine regiment, 3d marine division, on d-day, 21 july, following close on the heels of intensive naval gunfire and carrier-based aircraft attacks. the attack transport put ashore her battle-garbed marines on the asan beaches on the northern shores of guam.