Battle of Kawasaki
1057 CE.
Shown on the map at 38.849°, 141.294°.
The Battle of Kawasaki was the first major battle of the Early Nine Years' War (Zenkunen War) (1051–1063). It was fought between the forces of the Abe clan, led by Abe no Sadato, and those of the Minamoto clan, acting as agents of the Imperial Court, and led by Minamoto no Yoriyoshi and his eighteen-year-old son Yoshiie.
Text from the Wikipedia article Battle of Kawasaki, licensed CC BY-SA 4.0.