In 1590, Odawara Castle which was the home ground of Hojo, the strongest Daimyo (feudal lord) in Kanto Area, was surrounded by the military of Hideyoshi Toyotomi. Hojo clan was the last resistance for Hideyoshi to take over Japan. Odawara Castle was the biggest castle in the world at that moment. However, Hideyoshi surrounded by the biggest army of Japan. Hojo's plan was use all of castles in Kanto, to against Hideyoshi by guerrilla attacking. However, Hideyoshi defeated all those castle one by one with all his samurai, and finally Odawarajo was fallen. And this was the sign of that Hideyoshi conquered all over Japan.