206 BC, Liu Bang established the Western Han dynasty. Western Han Dynasty, "Han Cheng Qin system" has inherited the Qin Dynasty Western Han Dynasty wolf blood, Han Dynasty in the character that is the second emperor, Han Dynasty historian says, "little different from the Emperor carry on," aggressive warlike, lifting the nation strength of financial resources, year after year conquest, without compromise, and eternal rest until the Huns. Then Han, war party a dominant role, "Rui Shi-Yong light to die full of court", a great ancient Qiang of "killed in action as unlucky as to end the ominous disease," the national character. Emperor Wu also boldly Li Guang, Wei Qing, Huo Qubing and so full of lofty sentiments of the general nature of the wolf to attack cavalry cavalry, to riding and shooting on the riding and shooting, fierce and bold, long-range raid, in-depth grasslands, bloody Huns decades, beaten Huns decimated. The Han Emperor Wu also ingenious and even the Great Wall as a defensive project, but also become an economic blockade on the Prairie offensive weapons, iron weapons and forbidden medicine out of customs, beheaded a large number of