In the twenty-eighth year of Wuwei, the Prince, adhering to a plan devised by Army Supervisor Jiang Zhe, fourth-ranked Marquis of Chu, mobilized a significant number of troops to serve as the auxiliary force in the execution of Tan Ji. Afterwards, the auxiliary force marched hundreds of li to attack the main Northern Han army. At the same time, Long Tingfei, learning that the Prince was not with the main Yong army, launched a fierce a.s.sault. The Marquis of Chu personally beat the drums to encourage the army as the two armies battled continuously all day and all night without stop. On the ninth day of the eleventh month, when the Prince and his household troops were forty li from the battlefield, Long Tingfei recognized the difficult situation and retreated to avoid defeat. The Prince pursued for three hundred li. Long Tingfei personally commanded the rearguard, as the two forces fought over a dozen engagements without a clear victor. On the fifteenth day of the eleventh month, Northern Han’s Duan Wudi personally led troops to provide support. Recognizing the exhaustion of his troops, the Prince withdrew back to Zezhou. During the fortnight that the two armies had battled, the Yong army had suffered sixty thousand casualties, while the Northern Han army suffered close to forty thousand casualties. Some say there was no victor in this battle. However, henceforth the Northern Han army no longer had the ability to plunder and invade Zezhou and Zhenzhou.…

—Yong Dynastic Records, The Prince of Qi’s Family