Then, with Masatsuna OKABE and Nobushige YODA, both surviving retainers of the Takeda clan, and Mukawa-shu, a group of samurai in a marginal area in Kai Province as spearheads, Ieyasu himself invaded Kai Province, leading an army of 8,000 (Tenshojingo no ran (Tenshojingo Rebellion)).
家康は武田氏の遺臣・岡部正綱や依田信蕃、甲斐国の辺境武士団である武川衆らを先鋒とし、自らも8,000人の軍勢を率いて、甲斐国に攻め入った（天正壬午の乱）。