Battle of Nagamorihara

Timeline

1. 1510Echigo Province · Echigo ProvinceNagao Tamekage installed Uesugi Sanetsune as nominal shugo and counterattacked into Echigo from Etchū and Sado; Uesugi Akisane of the Kantō side briefly entered Echigo-Fuchū but failed to win the hearts of the kokujin, and began retreating with 800 horse, pursued by Tamekage with 500 horse.
2. 1510Nagamorihara, Echigo Province · Echigo ProvinceAkisane's side initially defended successfully, but Tamekage's reinforcement under Nakanashi Masamori attacked Akisane's main camp from the flank with 700 horse; Uesugi Akisane was killed in battle, and his generals including Nagao Sadaaki also fell. Tamekage thereby established a system of backing Sanetsune and ruling Echigo in substance; enmity between the Uesugi of Echigo and the Yamanouchi Uesugi continued for decades.