《魏书·帝纪·卷三》
皇帝命令在连接的船只上施放攻城车，断绝城内汲水的路线，又挖地道去夺占水井。
帝令连舰上施贲辒，绝其汲路，又穿地道以夺其井。
The emperor ordered to put siege vehicles on the connected ships, to cut off the water route in the city, and dug tunnels to seize the wells.