《资治通鉴·汉纪·汉纪三十七》
耿恭便命官兵在城上泼水给匈奴人看。匈奴人感到意外，以为有神明在帮助汉军，便撤走了。
乃令吏士扬水以示虏，虏出不意，以为神明，遂引去。
Geng Gong ordered his troops to pour water on the city and show it to the Xiongnu. The Xiongnu were surprised, thinking that the gods were helping the Han army, so they retreated.