US 3rd Marine Division landed near Agana and US 1st Provisional Marine Brigade landed near Agat on Guam, Mariana Islands; the landing was supported by US Navy Task Force 53. US Navy and US Army aircraft attacked Tinian of Mariana Islands, Eniwetok of Marshall Islands, and Truk and Yap of Caroline Islands as indirect support. Troops of the US Army 77th Infantry Division arrived in the afternoon; their landing was difficult due to the lack of LVT vehicles. A mile-deep beachhead was established at both landing sites by sundown. The Japanese attempted a counterattack during the night, which was repulsed.
