The First Battle of Uji, alternatively known as "Mochihitos Raising of an Army" in Japan is a battle which took place on June 20, 1180, following Prince Mochihito and Minamoto no Yorimasa's plan to raise an army to overthrow the Taira clan and the issuing of an edict urging the Minamoto clan, major temples, and shrines in the country to revolt.
Due to lack of preparation, the plan was discovered by the Taira, and Prince Mochihito and Yorimasa were defeated, dying at the battle. However, this triggered multiple anti-Taira forces to raise their armies. The battle is famous for having begun the Genpei War.
Wikipedia https://en.wikipedia.org/wiki/Battle_of_Uji_(1180)
Address (Unnamed Road), Kyoto, Japan
Coordinates 34°53'34.807" N 135°48'22.802" E