However, the 'Koyo Chinbutai' engaged the 'expeditionary force to the east' earlier at Katsunuma, losing the battle on March 6th; then, 'Koyo Chinbutai' continued to skirmish in one place after another onward toward the Nagareyama District, Shimosa Province (Currently this location is Nagareyama City, Chiba Prefecture).
が、3月6日勝沼で東征軍と戦闘して敗れ、下総国流山（千葉県流山市）へ転戦した。