淝水之戰
Later in 383, Former Qin's emperor, Fu Jiān, launched a major attack against Jin, intending to destroy it and unite China. At the Battle of Fei River, however, his forces panicked after trying to retreat to draw Jin forces across the river, and his army was routed with great losses, including his brother and prime minister, Fu Rong. Former Qin began to collapse after this defeat and never again posed a threat to Jin.