In late June or July 241, Sima Yi led an army from Luoyang to fight the Wu invaders. The Wei emperor, Cao Fang, personally saw him off at Luoyang's Jinyang Gate (). Upon reaching Fancheng, Sima Yi knew that he should not linger for too long because of the heat of summer. He first sent a lightly-armed cavalry detachment to harass the Wu forces while his main army remained in position. Later, he ordered his tired troops to rest and bathe, while a remaining group of hand-picked forces and enlisted volunteers were ordered to climb up Fancheng's city walls in order to reinforce the city and curb the enemy's siege. The Wu forces, led by Zhu Ran, retreated overnight upon hearing of this. Sima Yi and the Wei forces pursued the retreating Wu forces to the intersection of the Han, Bai, and Tang rivers, where they defeated and killed over 10,000 enemy soldiers and captured their boats, equipment, and other resources. Cao Fang sent a Palace Attendant as an emissary to meet Sima Yi at Wan to congratulate him and host a banquet to celebrate the victory.