Battle of Mikatagahara
The Battle of Mikatagahara was one of the most famous battles of Takeda Shingen's campaigns, one of the best demonstrations of his cavalry-based tactics, and was also one of Tokugawa Ieyasu's worst defeats and a complete disaster that was only narrowly averted. According to the Japanese calendar, the battle was fought on the 22nd day of the 12th month of the 3rd year of Genki.