Kammala jumla mai zuwa: Yaƙin Tekun Coral daga New Guinea a watan Mayu 1942 shi ne karo na farko da aka yi amfani da jirgin ruwa wanda aka yi amfani da shi a cikin IJN. A yakin Midway a watan Yuni, an dakatar da wani shirin mamayewa na Japan. IJN ya rasa masu sufurin jiragen ruwa hudu a Midway, wanda ya haifar da IJN ba zai sake yin wani babban nasara ba. IJN ta Aleutian Islands yaƙin neman zaɓe, kuma a watan Yuni, ya kasance dabara nasara amma kadan sakamako. A watan Yuli, IJA ta fara yakin neman zabe a kan
Kokoda Trail don ɗaukar Port Moresby, amma a cikin babban rashin nasara na farko na yaƙin, sojojin Japan sun tsaya kuma sun juya a watan Satumba da sojojin Australia. Yaƙin Milne Bay a watan Agusta shi ne karo na farko da sojojin Allied suka yi nasarar tsayayya da harin amphibious na Japan, wanda ya tilasta sojojin Japan da suka sauka don janyewa. Yaƙin Guadalcanal ya kasance daga watan Agusta 1942 zuwa Fabrairu 1943 kuma shine farkon nasarar nasarar Allied a cikin Pacific. Allies sun kama Buna da Gona a arewacin tekun New Guinea tsakanin Nuwamba 1944 da Janairu 1945. Saboda haka, a cikin shekara guda da aka kai wa Pearl Harbor hari, Jafananci suka ba da umurni ga Allies. An samu wannan canjin ne ta hanyar dabarun da sojojin ruwa na Allied suka yi game da sojojin ruwa na Japan mafi girma kafin a kawo shirin gina jirgin ruwa na Amurka.