Lü Meng recommended Gan Ning to lead the assault on Wan County while he followed behind with the elite troops. When they attacked at dawn, Lü Meng himself beat a war drum to boost the soldiers' morale. They captured the fortress by noon. Around the same time, Cao Cao's general Zhang Liao was leading reinforcements from Hefei to help Zhu Guang. When he reached Jiashi (), he heard that Wan County had fallen to the enemy so he withdrew his troops. Sun Quan praised Lü Meng for his bravery and appointed him as the Administrator of Lujiang Commandery. Lü Meng gained 600 households from Xunyang County (尋陽縣; southwest of present-day Huangmei County, Hubei) for his "tuntian" system and had 30 more subordinates placed under his command.