Through the formation of the Koetsu Alliance (an alliance between the Takeda clan in Kai Province and the Uesugi clan in Echigo Province), Kagekatsu acquired Numata territory in Higashi Ueno, while it caused the dissolution of the Koso Alliance (an alliance between the Takeda clan in the Kai Province and the Hojo clan in Sagami Province).
甲越同盟の成立は東上野において沼田領が獲得できたものの、同時に甲相同盟の解消を招いた。