《汉书·传·蒯伍江息夫传》
首先向您投降而您不给他恩惠，那么边地之城都将互相转告说： 范阳县令首先投降而被杀。 一定会据城坚守，像金城汤池一样，难以攻取。
先下君而君不利之，则边地之城皆将相告曰 范阳令先降而身死 ，必将婴城固守，皆为金城汤池，不可攻也。
If you surrender to you first and you don't show him favor, then the border cities will all tell each other: The magistrate of Fanyang County surrendered first and was killed. They will surely defend the city, like a golden city and a moat, which is difficult to capture.