Ujimasa, knowing of the death of Nobunaga, informed Kazumasu TAKIGAWA of its continued cooperation, but later invaded Kozoke Province with an army of 43,000 soldiers after ordering Ujinao and Ujikuni to occupy the Province, and in the following battle of Kanna-gawa River, the Ujimasa's army won a sweeping victory and expelled Kazumasu TAKIGAWA in Mayabashi-jo Castle from Kozuke Province.
信長の死を知った氏政は、当初は滝川一益に引き続き協調関係を継続する旨を通知しているが、その後、氏直と氏邦に上野奪取を命じ、4万3千と称する大軍を上野に侵攻させ、神流川の戦いで大勝し、厩橋城の滝川一益を上野から追放した。