Han Xin was familiar with the art of war since he was a child. Later, after a friend's recommendation, he became a Ji doctor in Xiang Yu's hand. During his tenure, he had the opportunity to get in touch with Xiang Yu's strategic policy of arranging troops. It can be said that he learned a lot from Xiang Yu to turn theory into practice. He himself gave Xiang Yu a lot of opinions and suggestions, but Xiang Yu didn't adopt them and took him to heart. Han Xin felt that following Xiang Yu could not be reused, showing his ambition. Later, after hearing about Liu Bang's deeds, I admired him very much and decided to go to Liu Bang.
On the recommendation of Xiao He, Han Xin gradually gained the reuse of Liu Bang, making him the commander-in-chief of a million-strong army. He is invincible because he is very interested in the art of war, familiar with the art of war and has a solid theoretical knowledge. In addition, the opponent is Xiang Yu, who once worked as his subordinate, and he is very clear about his thinking of arranging troops. The ancients said, know yourself and know yourself. So when he led thousands of troops against Xiang Yu, it can be said that he knew the other side like the back of his hand, knew his weakness and hit the key.
Later, after Han Xin took refuge in Liu Bang, he won many battles. This allusion was also said by Han Xin. It can be seen that he is not only good at arranging troops, but also good at reading minds and using people's psychology for operational deployment. Therefore, there are many reasons why Han Xin can finally command the three armed forces and be invincible.