Mikatagahara

The Battle of Mikatagahara (三方ヶ原の戦い, Mikatagahara no Tatakai) is a battle that pits the Takeda clan against the Tokugawa clan. The Takeda have a clear advantage over their foes and Ieyasu is often forced to retreat. It is noted for being Shingen's final battle.

Samurai Warriors
In the first game of the series, Ieyasu ordered his men to hold their positions and only engage the enemy lightly. Nobushige Oyamada and his men began throwing rocks at the Tokugawa advance force, enticing them to attack. It worked; the advance for moved forward and was soon cut down, leaving a gap in the Tokugawa defense. Shingen formed his forces into a Scale Formation, and ordered his cavalry to charge the Tokugawa line. The Tokugawa held out only briefly, and were forced to retreat. Ieyasu left the Tokugawa main camp with Tadakatsu as rear guard, while Hanzo ambushed the Takeda main camp, killing Shingen. With his dying breath, he passed his will onto Yukimura, who soon ordered a discreet retreat. Yukimura then rode out, defeated Tadakatsu, and forced Ieyasu to retreat.

Kessen
Nobunaga can choose to personally fight Shingen in Kessen III. He goes there at Ieyasu's request and faces the land's most fearsome cavalry with three battalions. Shingen remains confident that his elite army is vastly superior to Nobunaga's men. If Nobunaga talks to the village folk during the battle, he will learn that Shingen has doubles of his army placed on the field. Once they defeat Shingen's double, the forest in the center of the field will clear to reveal the real Shingen's location. If Nobunaga wins the battle, Shingen will die from his battle wounds. Otherwise, the warlord passes away due to illness.