In September 1944, the US 1st Marine Division is on its way to another amphibious invasion in the Pacific – the tiny island of Peleliu. For almost half the Marines it will be their baptism of fire against veteran Japanese troops with a new defensive doctrine. Some American commanders call for the operation to be cancelled, but it goes ahead. By its end, half the Marines and all the Japanese will be killed or wounded – but was Peleliu worth it?