Siege of Futamata
1572 CE.
Shown on the map at 34.862°, 137.809°.
Futamata fortress was Takeda Shingen's first objective in his campaign against Tokugawa Ieyasu. In 1572 he left the siege of Futamata in the hands of his son and heir Takeda Katsuyori.
Text from the Wikipedia article Siege of Futamata, licensed CC BY-SA 4.0.