Xia Sai Qu by Lu Lun in Tang Dynasty. That night, the black geese flew very high, and Khan quietly escaped during the night. I was about to lead the light cavalry to catch up when the snow fell full of bows and knives.
In the dead of night, dark clouds covered the moon, and the wild geese on the horizon flew in horror. Khan's army tried to sneak away in the dark. Just as I wanted to lead the light cavalry to chase all the way, the heavy snow fell on the bow and knife.