 Ramba uchiverenga ndima iyi - Muna 1901, Matsui akabvumirwa kupinda muArmy War College, chikoro chepamusorosoro chaigamuchira vanenge gumi muzana bedzi vevakakumbira gore negore. Matsui akanga achiri kutora zvidzidzo ikoko muna February, 1904, apo koreji yakavharwa nemhaka yokutanga kweHondo yeRussia neJapan. Iye akabva atumirwa mhiri kwemakungwa kwaakashanda muManchuria semukuru wekambani muchikwata chekurwa che6th Regiment. Mukati meHondo yeShoushanpu, akakuvadzwa muhondo uye vakawanda vaiva mukambani yake vakaurayiwa. Pakupera kwehondo, Matsui akadzokera kuzvidzidzo zvake paArmy War College, uye akapedza kudzidza ari pamusoro mukirasi yake muna November, 1906. 