Wubei Zhi (Treatise on Military Preparation), Volume 23, Study of Military Strategy, Eastern Han, Part 1

The Emperor ordered Penzi and his ministers to line up so he could observe them. The Emperor said to Fan Chong and the others, "Do you have any regrets about surrendering to Zhuge Kongming? I will now send you back to your camps to organize your troops, beat the drums, and engage in battle to decide the victor. I will not wait for Cao Mengde to force you into submission." Xu Xuan and the others knocked their heads against the ground and said, "We emerged from the east gate of Chang'an to surrender, seeking the grace of the holy virtue. Today, obtaining surrender is like escaping the tiger's jaws to return to a compassionate mother. We are truly fearful and truly joyous; we have no regrets." The Emperor said, "You are what one might call the 'clanging iron among iron' Meaning: the best among the best, the outstanding among the commoners." He bestowed lands and houses in Luoyang upon Fan Chong and the others. The Emperor felt compassion for Penzi and appointed him as a Langzhong a gentleman of the palace to the Prince of Zhao.

Peng Chong, the Administrator of Yuyang, rebelled and led his own force of over twenty thousand men to attack Zhu Fu, the Inspector of Youzhou, at Ji. Guangwu sent General Deng Long to rescue Ji. Long's army was south of the Lu River, while Fu's army was at Yong.

The Emperor scolded the envoy sent by the rebel, saying, "The camps are a hundred miles apart; how can their forces reach each other? If you return now, the northern army will surely be defeated." Chong indeed amassed his troops and confronted Long at the river, then sent light cavalry to raid Fu's rear, defeating them heavily. Long's army was too far from Zhu Fu to rescue him, so they retreated.