The City of Odawara, located in present-day Kanagawa Prefecture, flourished as the castle-town of the Houjou Clan, whose strategic fortress of Odawara Castle served as an impregnable stronghold for several generations of the clan during the Sengoku. During the Edo Period, it became the castle-town of Odawara-han and controlled the East Sea Road between Edo and Tokugawa stations west of Hakone.