Siberian Intervention
Iida was a native of Yamaguchi prefecture and a graduate of the 20th class of the Imperial Japanese Army Academy in 1908 and the 27th class of the Army Staff College in December 1915. Iida was promoted to captain in December 1918. He participated in the Japanese Expeditionary force for the Siberian Intervention against the forces of the Bolshevik Army, supporting White Russian forces in Russia.