Japan had reached its first goals quickly, taking the Philippines, Malaya, Singapore, and the Dutch East Indies (now Indonesia). This gave Japan petroleum, which it needed to make more war. Planning for a second part of the operations started in January 1942. However, disagreements between the Imperial Army and Imperial Navy, and among naval commanders, prevented finishing the plan until April 1942. Admiral Yamamoto said he would quit if his plan for the Central Pacific was not accepted. It was accepted.