《资治通鉴·汉纪·汉纪十一》
李广因东路绕远，水草也少，主动请求说： 我的部队是前将军的部队，而今大将军却改命我部为东路军。
东道回远而水草少，广自请曰： 臣部为前将军，今大将军乃徙令臣出东道。
Because the east route was longer and there was less water and food, Li Guang took the initiative and said: “My army is the vanguard, but now the general has ordered my army to be the east route army.”