《汉书·传·李广苏建传》
率军向东南行进，沿着旧龙城道路行军，四五天到达大泽葭苇中，匈奴从上风放火，李陵也让军中放火烧出隔离带以自救。
引兵东南，循故龙城道行四五日，抵大泽葭苇中，虏从上风纵火，陵亦令军中纵火以自救。
The army marched southwest, following the old Long Cheng road, and after four or five days reached the marshes and reeds of Daze. The Xiongnu set fire from the upwind side, and Li Ling also had his army set fires to create a firebreak to save themselves.