The siege of Kaminojo the Siege of Kaminojo was a battle during the Sengoku period

Sengoku period

The or Warring States period in Japanese history was a time of social upheaval, political intrigue, and nearly constant military conflict that lasted roughly from the middle of the 15th century to the beginning of the 17th century. The name "Sengoku" was adopted by Japanese historians in reference...

 (16th century) of Japan.

With the help of his ninja vassal Hattori Hanzo, Tokugawa Ieyasu

Tokugawa Ieyasu

 was the founder and first shogun of the Tokugawa shogunate of Japan , which ruled from the Battle of Sekigahara  in 1600 until the Meiji Restoration in 1868. Ieyasu seized power in 1600, received appointment as shogun in 1603, abdicated from office in 1605, but...

, after a well fought battle, ended up capturing the castle of Kaminojo from its keeper, Udono Nagamochi, a general of the Imagawa. Throughout Ieyasu's victory over the capuring of Kaminojo, Ieyasu obtained many useful hostages to use against that of the Imagawa, who were currently in possession of his own family.