《汉书·传·李广苏建传》
皇上赐书李陵，李陵留下军官和士兵，与轻骑五百出敦煌，到盐水，迎接贰师将军还师，然后驻屯张掖。
上赐陵书，陵留吏士，与轻骑五百出敦煌，至盐水，迎贰师还，复留屯张掖。
The emperor wrote to Li Ling, Li Ling left the officers and soldiers behind, and with 500 light cavalry left Dunhuang and went to Yanshui to greet the General of the Two Generals and return to the army, and then stationed at Zhangye.