In 1511, when Owari Province Shugo, Yoshitatsu SHIBA, attacked Osakabe-jo Castle, owned by the Imagawa family (in Hamamatsu City), Ujichiki mobilized his army and fought off the attack.
永正8年（1511年）に尾張国守護斯波義達が今川方の刑部城（浜松市）を攻め、氏親が出陣してこれを退けた。