《资治通鉴·汉纪·汉纪十八》
于是汉宣帝任命侍中许延寿为强弩将军，就地任命酒泉太守辛武贤为破羌将军，颁赐诏书嘉勉辛武贤的建议，并写信责备赵弃国说： 如今到处都在向前方输送军粮，使百姓受到烦扰，将军率领大军一万余人，不及早利用秋季水草茂盛的时机，争夺羌人的牲畜、粮食，却要等到冬季再行出击，但那时羌人都会积蓄粮食，多数藏匿于深山之中，据守险要，而将军士卒寒苦，手足皲裂，难道会有利吗！
上乃拜侍中许寿为强弩将军，即拜酒泉太守武贤为破羌将军，赐玺书嘉纳其册。以书敕让充国曰： 今转输并起，百姓烦扰，将军将万馀之众，不早及秋共水草之利，争其畜食，欲至冬，虏皆当畜食，多臧匿山中，依险阻，将军士寒，手足皲瘃，宁有利哉！
So Emperor Xuan appointed Xu Yanshou, a servant, as a strong crossbow general, and appointed Xin Wuxian, the governor of Jiuquan, as a general to break Qiang on the spot. The edict commended Xin Wuxian's suggestion and wrote a letter to Zhao Qiguo, saying: Now the food is being transported to the front everywhere, which disturbs the people. The general led more than 10,000 people in the army and did not seize the opportunity of abundant autumn grass to fight for the Qiang people's livestock and food. Instead, he waited until winter to attack. By then, the Qiang people would have accumulated food, and most of them would have hidden in the mountains, guarding the dangerous places. The soldiers of the general will suffer from the cold and their hands and feet will crack. How can it be beneficial!