Tuyuhun invasion of Gansu

"[2] He devised a decoy by sending two dancing girls and a group of musicians to a small hill near the Tuyuhun camp.

[1] The musicians played the pipa, a stringed instrument of foreign origin,[1] while the girls positioned themselves on top of a hill.

The attention of the Tuyuhun was diverted entirely towards the girls [2] as the soldiers disbanded their military formation[3] and rushed to the hill for a clearer view of the dance.

Fitzgerald ends his description of the Tuyuhun defeat with the moral that "it is most unwise, in the midst of battle, to let the mind dwell on the delights of peace.

Between 634 and 635, Emperor Taizong conducted a large military expedition against the Tuyuhun led by the general Li Jing.