Odawara Castle (小田原城) is the home of the Hōjō clan during the Warring States period. Due to their wealth and influence, they were subject to several battles with their rivals within the Kantō region. The castle's bountiful surroundings and fierce natural defenses made it a difficult castle to take. Ujiyasu uses the surroundings to his advantage and successfully repels his rivals, Kenshin and Shingen, for a decade. When Shingen retreated from his unsuccessful siege, Ujiyasu's sons pursued his army at Mimasetōge. The castle's defenses during these battles gave birth to its reputation as an impenetrable fortification.