His uijin (first battle) was the Siege of Minowa-jo Castle in Ueno Province (also known as the Siege of Matsuyama-jo Castle in Musashi Province or the Siege of Musashi Province).
初陣は、永禄6年（1563年）の上野国箕輪城攻め（武蔵国松山城(武蔵国)攻めとも）。