Mezue ahịrịokwu na-esonụ: Na 1900, Ōkubo ghọrọ lieutenant general na onye isi ndị ọrụ nke General Inspectorate of Military Training. Na Mee 1902, ọ ghọrọ onye isi nke IJA 6th Infantry Division. N'oge agha Russia na Japan, IJA 6th Infantry Division so ndị agha nke abụọ nke ndị Japan, mana mgbe agha ahụ gasịrị, ndị agha nke abụọ nke ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha nke ndị agha.
Agha nke Shaho bufere ndị agha nke anọ nke ndị Japan tupu Agha nke Mukden. Mgbe agha ahụ gasịrị, e nyere ya Order nke Rising Sun, klas nke 1 na Order nke Golden Kite, klas nke 2. N'ọnwa Julaị afọ 1906, e zigara ya ka ọ chịwa ngalaba nke atọ nke IJA ma na Septemba afọ 1907, e buliri ya n'ọkwa "kazoku" na aha "danshaku" (baron).