Han Xin taught himself the art of war and first defected to Xiang Yu. Unexpectedly, Xiang Yu only asked him to be a guard. He was disappointed and went to Liu Bang again. Liu Bang didn't pay attention

Han Xin taught himself the art of war and first defected to Xiang Yu. Unexpectedly, Xiang Yu only asked him to be a guard. He was disappointed and went to Liu Bang again. Liu Bang didn't pay attention to him either, and Han Xin planned to leave again, just because Xiao He admired his talents after talking with him, and after he deserted, he hurriedly chased him, leaving a good story in history like "Xiao He chased Han Xin under the moon". After Xiao He recovered Han Xin, he vouched for Han Xin with his own head, which made Liu Bang change his mind, worship Han Xin as a general, and put the main army under his command. The emperors of later generations were really uneasy about recruiting "freelance workers" to take on important military responsibilities. In the following dynasties, there were no examples of tourists being immediately worshiped as generals. The main sources of officers in the past dynasties include the following aspects: "military background" promoted from soldiers, "official background" inherited by the children of officers, and "imperial examination background" similar to civilian officials that appeared after the Sui and Tang Dynasties. In addition, there are also various Young military attachés are appointed by civilian officials or staff.