The Battle of Sanpohara was an important engagement that took place on January 25, 1573, in the Sanpohara region of Fushi-gun, Tōtōmi Province, during the Warring States period of Japan. The belligerents were the combined forces of the Tokugawa and Oda clans, led by Tokugawa Ieyasu and Oda Nobunaga respectively, against the Takeda army led by Takeda Shingen. Here is some information about this battle:

1. The combined forces of the Tokugawa and Oda clans: Led by Tokugawa Ieyasu and Oda Nobunaga, respectively, the allied army consisted of approximately 100,000 troops. Tokugawa Ieyasu's forces occupied the eastern side of the battlefield, while Oda Nobunaga's troops occupied the western side.

2. The Takeda army: Led by Takeda Shingen, the Takeda army numbered around 80,000 soldiers. They adopted a defensive strategy, utilizing the terrain advantages and fortifications to repel the enemy.

3. Battle progression: At the outset of the battle, the combined forces of the Tokugawa and Oda clans launched the initial attack. However, due to the stubborn resistance of the Takeda army, the battle stalled. In the end, the Takeda army suffered heavy losses in soldiers and commanders, forcing them to retreat.

In summary, the Battle of Sanpohara was a famous engagement in history, and its outcome had far-reaching implications for the political landscape of Japan during the Warring States period. According to reliable sources, the combined forces of the Tokugawa and Oda clans numbered approximately 100,000 troops, while the Takeda army numbered around 80,000. These figures reflect the relative strength of the various forces involved and the scale of the war.

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