 The 1st Marines would push north into the Umurbrogol, while the 7th Marines would clear the southern end of the island.Only one battalion was left behind in reserve, with the U.S. Army's 81st Infantry Division available for support from Angaur, just south of Peleliu.On September 4, the Marines shipped off from their station on Pavuvu, just north of Guadalcanal, a trip across the Pacific to Peleliu.