Siege of Fukazawa
1571 CE.
Shown on the map at 35.324°, 138.956°.
The 1571 siege of Fukazawa castle was one of a number of battles which formed Takeda Shingen's campaigns against the Hōjō clan, during Japan's Sengoku period.
Text from the Wikipedia article Siege of Fukazawa, licensed CC BY-SA 4.0.