Operation Causeway was Nimitz's 1944 proposal to invade Taiwan. Doing so would have bypassed the Philippines, which was the route MacArthur had favored taking. Operation Causeway would have consisted of 400,000 U.S. soldiers and marines landing at the southwest of the island and fighting their way north towards Taipei. Considering how much Taiwan contributed to the Japanese war effort, with all it's ports and airfields, food supply, and volunteers, why was MacArthur's plan chosen instead of Nimitz's. Was it only because of MacArthur's promise to return and liberate the Philippines back in 1942?