Imagawa clan
Hanzo had a great contribution to Tokugawa Ieyasu's rise to power, helping the future Shogun bring down the Imagawa clan. After Imagawa Ujizane had held Ieyasu's wife and son as hostages in 1561, Hanzo made a successful hostage rescue of Tokugawa's family at Kaminogo castle in 1562; and went on to lay siege to Kakegawa castle in 1569 against the Imagawa clan.