On 4 September 1944, "PC-598" formed up with the Tractor Group of the Western Attack Force and began anti-submarine screening on the way to the Invasion of Peleliu. The convoy arrived at Peleliu in the early morning of 15 September. The invasion plan called for the 1st Marine Division to assault the beachhead with three regiments. The 1st Marine Regiment (under the command of Colonel "Chesty" Puller) would be on the left flank, assaulting beaches White 1 and White 2. In the center would be the 5th Marine Regiment assaulting beaches Orange 1 and Orange 2. The right flank would be held by the 7th Marine Regiment assaulting Orange 3.