A watan Mayu na shekarar 1942, sai Laftanar Shiga ya dauki umurnin jirgin sama mai dauke da jirgin sama "Jun'yō's", wani matsayi da ya yi har zuwa Disamba 1942. A wannan lokacin, Shiga ya jagoranci mayaƙan jirgin a yaƙe-yaƙe na
Dutch Harbor da tsibirin Santa Cruz. A cikin wannan yaƙin, ya kai hari kan masu jigilar Amurka, kuma, wanda tsohon ya nutse daga baya, yayin da "Enterprise" ya lalace sosai. Daga bisani ya umurci jirgin saman jirgin sama "Hiyō" daga watan Disamba na 1942 zuwa Janairu 1943 yayin da mai ɗaukar jirgin ya kasance a tashar jiragen ruwa a Japan.