《新五代史·列传·杂传第三十九》
因此趁人没有防备时攻击，没有比急攻更好的，我请求给我五百骑兵，飞驰到城下，以神速震骇他。 
故乘人之未备者，莫若急攻，臣请骑兵五百，驰至城下，以神速骇之。 
Therefore, attacking when people are unprepared is better than a siege, I ask you to give me 500 cavalry to gallop to the city and shock him with lightning speed.