Just before the fourth Battle of Kawanakajima, Kenshin led a big allied force of Togoku (the eastern part of Japan, particularly Kanto region) with more than 100,000 soldiers attacked Odawara-jo Castle in one stroke, and cornered the Hojo clan to the brink of collapse, Shingen TAKEDA took military actions in Shinano Province in an unguarded moment.
第四次川中島の合戦の直前、10万を超える東国の大連合軍を率いて一気に小田原城などに攻め込み北条氏を滅亡寸前まで追い詰めたが、隙をついて武田信玄が信濃にて軍事行動を起こした。