The Feishui Campaign-Ending
Although Zhu Xu had been made a senior official in King Fu Jian's court, he secretly maintained his allegiance to the Eastern Jin. Once again finding himself in the Eastern Jin camp, he felt the thrill of finally returning home, so he told commanders Xie Shi and Xie Xuan everything he knew about the Qian Qin Kingdom. He proposed that they attack first, before Fu Jian's troops all made it into battle position.
Xie Shi and Xie Xuan did as Zhu Xu advised. They gave Liu Lao the order to raid Luojian, which he captured. The bad news made Fu Jian rather uneasy. He walked up to the watchtower to observe his enemy.
What he saw sent terror into his heart: across the river, the Eastern Jin camps were lined up neatly, indicating a calm readiness. Farther away in the Bagong Mountains, what were actually phantasmal shadowy trees, to King Fu Jian, suddenly also looked like soldiers under cover. Disheartened, Fu Jian told his men to keep watch. Meanwhile, Xie Shi and Xie Xuan were anxious to cross the Feishui River to engage their enemy. They sent Fu Jian a letter challenging him to withdraw from the northern banks, so that there would be enough space for them to cross the river and launch a battle.
Fu Jian did not want to give his enemy any idea that he was afraid. Besides, it might be good for him to allow the Eastern Jin to cross the river, and then he himself attempted a surprise attack while the enemy was halfway across.
At the agreed time, Fu Jian ordered his troops to fall back to clear enough room for his cavalry to launch a sudden attack on the Eastern Jin troops, who would be busy crossing the river. But things soon got out of control, after his soldiers, already fearful and sick of the war, broke into panicked, unstoppable flight.
Xie Xuan and his 8,000 cavalrymen quickly crossed the river and gave chase, completely destroyed King Fu Jian's army.
The battle at the Feishui River spelled doom for the Qian Qin. Fu Jian was killed by his officer, Yao Chang, in Luoyang, and his kingdom fell.