Mariupol

In the third year of Jian’an (199), Cao Cao attacked Lv Bu, who retreated to xiapi city. Cao Cao wanted to retreat. Xun you and Guo Jia advised Cao Cao to attack Lv Bu urgently. Cao Cao listened to his plan, so he led the water of Yi River and Si River into the city. Xiapi city collapsed and captured Lv Bu alive.