The next battle for the 1st Marine Division would be the bloodiest yet at the Battle of Peleliu. They landed on 15 September 1944 as part of the III Amphibious Corps assault on the island. The division's commanding general, Major General William H. Rupertus had predicted the fighting would be, "...tough but short. It'll be over in three or four days – a fight like Tarawa. Rough but fast. Then we can go back to the rest area." Making a mockery of the prediction, the first week of the battle alone cost the division 3,946 casualties, during which time they secured the key airfield sites. The division fought on Peleliu for one month before being relieved. Some of the heaviest fighting of the entire war took place in places such as "Bloody Nose Ridge" and the central ridges of the island that made up the "Umurbrogol Pocket". The month of fighting against the 14th Division (Imperial Japanese Army) on Peleliu cost the 1st Marine Division 1,252 dead and 5,274 wounded.