In 1570 Nobunaga broke his oath with Nagamasa not to fight Asakura, advanced along the western shore of Lake Biwa with Ieyasu TOKUGAWA and started to attack the castle of Asakura in Echizen Province.
元亀元年（1570年）、信長が長政と交わした「朝倉への不戦の誓い」を破り徳川家康と共に琵琶湖西岸を通過して越前の朝倉方の城を攻め始める。