In 383 A.D., the former Qin Dynasty, which had just completed the brief reunification of the north, competed with the Eastern Jin Dynasty in the south. Although the pre-Qin dynasty claimed to be 800,000, it was actually 200,000, and it was patched up by ethnic minorities and Han people. Although there were only 80,000 people in the Eastern Jin Dynasty, they had strong fighting capacity and fought for the country. The two sides fought a battle of defeating the strong with the weak in Feishui, southeast of Shouxian County, Anhui Province.

Fu Jian, the former monarch of the Qin Dynasty, has used Wang Meng, a Han nationality, extensively since the establishment of the dynasty in 357, and has implemented a series of measures for sinicization. He worked hard to govern the country, reform internal affairs and promote national integration and cultural prosperity. With the relative stability of the regime, the whole pre-Qin dynasty flourished. With the increasing national strength, the former Qin dynasty wiped out the northern countries with military power. The former Qin Dynasty, which gradually completed the unification of the north, turned its attention to the Eastern Jin Dynasty in the south. At this time, Fu Jian wanted to unify the whole country.

But as prime minister, Wang Meng has been urging Fu Jian not to send troops to the Eastern Jin Dynasty. On the one hand, the former Qin dynasty had just unified the north, and the nation was very unstable. However, the Eastern Jin Dynasty was sitting on the natural barrier of the Yangtze River and it was an anti-aggression war, and the people's hearts were clear at a glance. The arrogant Fu Jian was completely carried away by her superficial strength. In 383, Fu Jian led an army of 800,000 to attack the Eastern Jin Dynasty. When the crisis came, the Eastern Jin Dynasty put aside internal contradictions, and the Prime Minister Xie An came out of the mountain and took 80,000 northern government soldiers to fight the former Qin Dynasty in Huaishui.

Looking at the mighty army in front of him, Fu Jian proudly said, "When we throw our whip into the river, we can cut off the water." This is the origin of "whipping the water.". The Eastern Jin Dynasty, which won the first battle, worked day and night, and the two sides fought a decisive battle at the water. When Fu Jian boarded Shouyang City, he saw the soldiers of the Eastern Jin Dynasty and the vegetation on Bagong Mountain. He thought it was also the Jin army, and he was afraid. This is the origin of "every grass and tree is a soldier".

At this point, the offensive and defensive trends of both sides are different. The morale of the former Qin Dynasty was low, and soldiers of all ethnic groups were war-weary. Only an early decisive battle can be beneficial to the former Qin Dynasty. Taking advantage of Fu Jian's mentality, the Eastern Jin sent messengers to the former Qin camp, pretending to ask for retreat and letting the Jin army cross the river. As a result, Fu Jian really fell for it, and the Eastern Jin Dynasty suddenly sent troops halfway in the former Qin Dynasty. Former Qin Jun was defeated like a mountain, and even the wind and fleeing thought it was a pursuer. This is the source of "trembling".

The Battle of Feishui changed the situation in China: the Eastern Jin turned the corner and the south was relatively stable; The former Qin dynasty collapsed rapidly, and the north fell into chaos again. China, which failed to complete reunification, is once again divided. Located in Feishui, Anhui Province, it has become very famous. Its source is Jiangjun Mountain between Feixi and Shouxian. The water is divided into two tributaries, which flow northwest and leave Shouxian County and enter the Huaihe River. What flows southeast flows into Chaohu Lake, most of which is in today's Anhui Province. And the four idioms of the Battle of Feishui: the wind is shivering, the grass is full of soldiers, the whip is cut off, and the stage is back, which have also been passed down to this day.