大陸打通作戦
On 1 March 1943 he was appointed Commander of the 6th Army based in Hailar replacing General Seiichi Kita. In May 1944 the 6th Army participated in Operation Ichi-Go On 1 July 1944 he was appointed Commander of the newly formed 29th Army and based in Malaya in anticipation of an Allied attack. Ishiguro died on 8 January 1950.