Daga baya ya kammala karatu daga aji na 28 na Kwalejin Ma'aikatan Sojoji a 1916. Bayan ya yi aiki a cikin ma'aikata da matsayi na gudanarwa a cikin Janar Janar na Sojojin Japan, an tura Shimomura zuwa Faransa a matsayin jami'in soja a shekarar 1919. Ya koma Ofishin Dabarun da Shirye-shiryen Janar Janar a 1921. Ya shiga cikin tawagar Jafananci zuwa taron tattaunawar Naval na Geneva daga 1928-1929 da kuma 1931. Daga 1935-1935 ya kasance kwamandan kwamandan na 1st Army Kitashirakawa Naruhisa, Mitsuru Ushijima, Heitarō Kimura, Takashi Sakai, da Shōjirō Iida. Daga baya ya kammala karatu daga aji na 28 na Kwalejin Ma'aikatan Sojoji a shekarar 1916. An ba shi mukamin babban laftanan Janar a shekarar 1936, kuma an ba shi izinin janar na farko a matsayin Janar Janar Janar Janar na Babban Rundunar Sojoji na Japan a yankin da ke gabashin Kogin Kwantung.
Shekara ta 1916