Initially, Tomosada served the Shiba clan. When the Shiba clan lost its power, Tomosada waged war against Oda Nobunaga. During the Battle of Okehazama, Tomosada served under the Imagawa and led a small unit. Afterwards, Tomosada recruited people from temples, shrines, and other places to beckon a larger sum of troops, even offering free officers to protect their land from Oda invasions.
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