In 39 1 year BC, Tian replaced Qi, and in 453 BC, the three tribes were divided into Jin, forming Han, and formally forming Qi, Chu, Yan, Han, Zhao, Wei and Qin. And in 22 1 BC, the seven-nation struggle began to unify the world war and the whole country. Among them, the most famous battles are the Battle of Gui Ling of Wei in 353 years ago, the Battle of Ma Ling of Qi in 34 1 year ago, and the Battle of Changping of Qin and Zhao in 262 years ago. The characteristic war is large in scale and lasts for a long time, with infantry and cavalry as the main arms. Field battle and encirclement battle replaced the car war in the Spring and Autumn Period, and both adopted circuitous sports tactics.