A revolt by the vassals of the Chousokabe clan against the surrender of their stronghold, Urado Castle, which occurred in 1600 after the Battle of Sekigahara, in which Chousokabe Morichika of Tosa fought on the losing side. Chousokabe was exiled, and Tokugawa Ieyasu sent an envoy to take Urado Castle.

According to the Tosa Tales, 273 rebels were killed, including 8 generals of the Ichiryou Gusoku.