When the Jinshin war broke out, Prince Oama who was in Yoshino no miya palace, didn't have any armed forces, so the Prince first sent envoys to take up arms in Togoku (the eastern part of Japan, particularly Kanto region) and headed for that direction.
壬申の乱が勃発したとき、吉野宮にいた大海人皇子は兵力を持たず、使いをたてて東国で兵を集めさせつつそちらに向かった。