Political map of East Asia and the Western Pacific 18 April 1942 (Doolittle Raid): In April, with the Japanese on the advance everywhere (Pacific War), the United States launched their reprisal for the Pearl Harbor attack (Attack on Pearl Harbor). This, the Doolittle Raid, consisted of bombers launched from an aircraft carrier with the intention of striking Japan and crash-landing in China. It achieved little militarily, but demonstrated to the world that Japan was still vulnerable.