Simultaneously, he also attended class work at the Tokyo University of Foreign Studies, graduating in March 1917 with a degree in French.

He then entered the 33rd class of the Army Staff College, emerging in 1919 as a captain in the infantry.

[1] during his time as military attache in Turkey he criticized Turkish General staff's lectures on Russo-Japanese War and sent a memo about inaccuracies in their published works.

[2] With the start of the Second Sino-Japanese War, Iimura was promoted in March 1937 to major general.

[3] Iijuma was recalled to Japan in 1943 to resume his position as Commandant of the Army Staff College, but with the situation continuing to deteriorate for the Japanese in the southern front of the Pacific War, he was reassigned to a combat command as Chief of Staff of the Southern Army in 1944, and Commander in Chief of the depleted 2nd Area Army, based in Manchukuo from 1944-1945.