Zhang Liao
In 221, after Sun Quan pledged allegiance to Wei again, Cao Pi reassigned Zhang Liao from Hefei to the garrison at Yongqiu (雍丘; present-day Qi County, Henan), where Zhang Liao fell sick. When Cao Pi learnt that Zhang Liao was ill, he sent Liu Ye to visit Zhang Liao and bring along an imperial physician to treat him. He also ordered the "huben" guards to serve as messengers to constantly update him on Zhang Liao's condition – to the point where these messengers frequently encountered each other along the way while they were travelling between Cao Pi and Zhang Liao's locations. Later on, before Zhang Liao had recovered, Cao Pi visited him, held his hand, gave him an imperial robe as a gift, and ordered his servants to prepare imperial cuisine for Zhang Liao. Zhang Liao returned to the garrison after his condition improved significantly.