Why did Tokugawa Ieyasu move his headquarters to Hamamatsu in 1570?

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Statue of Tokugawa Ieyasu in ornate robes holding a bow, with arrows on his back, at the Tosho-gu shrine in Nikko, Japan. — Tokugawa Ieyasu Statue of Tokugawa Ieyasu at the Tōshō Shrine in Nikkō, Japan.

Tokugawa Ieyasu moved his headquarters to Hamamatsu in 1570 to facilitate his territorial expansion to the east as the Imagawa domain disintegrated.1

By relocating to this coastal town, Ieyasu was able to develop it into a vital commercial and strategic center for his growing domain. This move allowed him to solidify his position as a daimyo while relying on his alliance with Oda Nobunaga to navigate the period's endemic warfare.1