 Complete the following phrase:  In 208, Man Chong led his troops from Ru Commandery to join Cao Cao on a military campaign to conquer Jing Province and attack the rival warlords Sun Quan and Liu Bei. After Cao Cao retreated back to the north following his defeat at the Battle of Red Cliffs in the winter of 208209, he appointed Man Chong as acting General of Vehement Might  and ordered him to remain behind in Jing Province to defend Dangyang. However, after Cao Caos forces lost the 