Xu Huang
At the time, Guan Yu had set up a camp at Yancheng (偃城; north of present-day Xiangyang, Hubei). When Xu Huang showed up, he ordered his troops to pretend to dig trenches around Yancheng to fool the enemy into thinking that they were trying to cut off the supply routes leading to Yancheng. The enemy fell for his ruse, burnt down their camp and abandoned their position, thus allowing Xu Huang to gain a foothold at Yancheng. After capturing Yancheng, Xu Huang pressed on and set up two linked camps about 30 "zhang"s away from Guan Yu's encirclement. Before Xu Huang attacked, Cao Cao sent Yin Shu (殷署), Zhu Gai (朱蓋) and other officers to lead another 12 military units to support him.