However, his intelligence and outstanding character remained even during the Japanese-Russo War and an official recorded is left that, he presided over the staff officer meetings, actively asked reports, and conducted the commands when Kojima took a trip to Lushun for encouraging the third troop of the Japanese Army.
ただし俊異の性格は日露戦争中も残っており、児玉が旅順に第3軍(日本軍)督励のため出張している間は、大山が自ら参謀会議を主宰し、積極的に報告を求め作戦を指揮したという公式記録が残っている。