Although Lian Po's tactics were correct, Zhao Junchen, who was far behind, mistakenly thought that Lian Po was scared by Qin Jun and did not dare to play. After all, Changping is close to Zhao, but the materials consumed by hundreds of thousands of troops of Zhao every day are astronomical. Besides, almost all adult men go to fight as soldiers. If they can't win quickly, Zhao is under great pressure. Therefore, Zhao Junchen was very dissatisfied with Lian Po. He planned to choose a brave general to replace the timid Lian Po, including Zhao Kuo, the son of Zhao She, a famous soldier of Zhao.
After Zhao Junchen's dissatisfaction was learned by the spies of Qin, Qin immediately carried out a double spy and sent spies to spread rumors in Handan, the capital of Zhao. On the one hand, he said that the famous soldier of Qin was not afraid of the old man Lian Po, and the only thing he was afraid of was Zhao Kuo, a young hero with high attainments in the art of war. On the other hand, he said that Lian Po didn't fight because he wanted to abolish Zhao Guojun, out of self-esteem. Zhao Junchen believed it, did not listen to Lian Po's explanation, cut off the recall of the relieving, and appointed the much-anticipated young hero Zhao Kuo as the commander-in-chief of Zhao.
When Zhao Kuo's new official took office, he threw aside the impregnable camp that Zhao had built for a long time at the beginning of his tenure, and took the initiative to fight, while the famous soldier took the shrewd tactics of staying out of the way, avoiding Zhao's soldiers' front, pretending to be an enemy but Zhao's slow retreat, so that Zhao could further stay away from those impregnable camps and jump into the trap already set.
Zhao Kuo didn't know it was a plan, but he thought that the retreat was really afraid of his reputation, so he even more brazenly directed Zhao's main force to pursue forward and planned to defeat it in one fell swoop. However, when Zhao left his camp and entered the preset battlefield, he immediately commanded to launch a counterattack. Qin Jun's main ambush came from the left and right wings, and defeated the arrogant Zhao in one fell swoop, and sent him to intercept the route for providing foodstuff behind Zhao, and made a tactical encirclement of Zhao. (In this campaign, the State of Qin mobilized all men above 14 to participate in the war, and the able-bodied went into battle to kill the enemy, while the infirm carried grain in the rear, which exceeded the total strength of Zhao in one fell swoop. )
Zhao Kuo tried to break through several times at first, hoping to rush out before Zhao's morale was low, but Qin Jun, who had strong fighting capacity, turned Zhao back every time. Seeing that there was no hope of breaking through, Zhao Kuo ordered the troops to stand by in situ, waiting for the Zhao troops stationed in the camp to come to the rescue.
However, Zhao's grain route was cut off, and the amount of grain carried by the army was not much. After learning that he was surrounded, Zhao Kuo's arrogance immediately turned into depression, especially several desperate breakthroughs were turned back with more despair, which greatly damaged Zhao Kuo's self-confidence and did not dare to attack without authorization. He just kept counting on reinforcements, but they couldn't get close.
Finally, Zhao Ran ran out of food and grass and was about to collapse. Zhao Kuo ordered the whole army to assault, and was shot dead by Qin Jun's disorderly arrows in the disorderly army. Zhao Junqun was leaderless and had to surrender.