Imagawa clan
In 1551, an army under the command of Imagawa Sessai laid siege to the castle where Oda Nobuhiro, Nobuhide's eldest son, was living. Nobuhiro was trapped by the Imagawa clan, but was saved by Oda Nobunaga, Nobuhide's second son, through negotiations. Sessai made an agreement with Nobunaga to take Ieyasu back to Imagawa, and he agreed. So Ieyasu (now nine years old) was taken as a hostage to Sunpu. At Sunpu, he remained a hostage, but was treated fairly well as a potentially useful future ally of the Imagawa clan until 1556 when he was 14 years old.