This is an issue game of "Bushi Life" #3, depicts the Battle of Kotesashi, a samurai battle between Nitta Yoshisada and Sakurada Sadakuni on May 11, 1333. This battle was a part of the decisive Kōzuke-Musashi Campaign during the Genkō War in Japan that ultimately ended the Kamakura Shogunate. https://en.wikipedia.org/wiki/Battle_of_Kotesashi_(1333)