長篠之戰
In 1575, Narimasa fought at Battle of Nagashino againts Takeda Katsuyori from Takeda clan. Later, he was given Komaru Castle in Echizen, where he had recently helped put down rioting Ikkō-ikki, and became a member of the so-called Sanninshu (Echizen Triumvir) along with Maeda Toshiie and Fuwa Mitsuharu.