In the midst where both armies were vying to consolidate their forces after the break out of the Jinshin War, the Kawachi Province sided with Prince Otomo (Emperor Kobun), leveling their sphere of influence against OTOMO no Fukei of Wa Province (Yamato Province) who joined Prince Oama's forces.
壬申の乱が勃発してから双方が兵力を興す中で、河内は大友皇子（弘文天皇）側に入り、大海人皇子側についた倭（大和国）の大伴吹負と勢力圏を接した。