 The traditional "banzai charge" attack was also discontinued as being both wasteful of men and ineffective.These changes would force the Americans into a war of attrition, requiring increasingly more resources.Nakagawa's defenses were centred on Peleliu's highest point, Umurbrogol Mountain, a collection of hills and steep ridges located at the center of Peleliu overlooking a large portion of the island, including the crucial airfield.