When Yoshimoto IMAGAWA was killed by Nobunaga ODA in May (in the old calendar) of 1560 in the Battle of Okehazama, Motoyasu, who had been detached from the main Imagawa troop and was attacking Odaka-jo Castle in Owari Province in the front line, retreated from Odaka-jo Castle.
永禄3年（1560年）5月、桶狭間の戦いで今川義元が織田信長に討たれた際、今川軍本隊とは別働で、前線の尾張国・大高城を攻略中であった元康は、大高城から撤退。