Zhao and Wei attacked Huayang, an important city in Korea, and Korea asked Qin for help, so King Zhaoxiang of Qin sent Wu Anjun Bai Qi, Marquis Wei Ran, and Keqing Hu Yang to lead an army to rescue Korea. The Qin army suddenly appeared on the battlefield in Huayang, taking advantage of the unpreparedness of the combined forces of Zhao and Wei to launch an attack, defeating the combined forces of Zhao and Wei. In this battle, the Qin army beheaded a total of 130,000 Wei troops, captured three Wei generals, Wei general Mangmao was defeated and fled, and the Zhao general Jia Yan was also defeated by the Qin army, and the Qin army captured 20,000 Zhao troops and sank them into the Yellow River. The Qin army took advantage of the victory to capture the Wei state's Juan County, Caiyang and Changshe and Zhao's Guanjin, and the Wei state was forced to sacrifice Nanyang to sue for peace with the Qin state.

After Qin captured the three cities of Zhao Lin, Lishi, and Qiba, Zhao took Gongzi Yu as a proton, and signed an agreement with Qin to exchange the three cities of Lin, Lishi, and Qiba with Jiao, Wei, and Niuhu, but then King Huiwen of Zhao repented. King Zhaoxiang of Qin was furious, and on the grounds that Zhao did not fulfill the agreement, he sent the general Hu Yang to lead a large army to attack Zhao Guoyan.

King Zhao Huiwen successively summoned Lian Po, Lecheng and other famous generals to inquire about countermeasures, and they agreed that the road was too far away and the road was narrow and difficult to save. King Zhao asked Zhao Hao again, and Zhao Hao was alone, saying that the terrain was dangerous and narrow, like two rats fighting in a cave, as long as the soldiers were brave, they could win. Later generations called it "the brave will win when they meet on a narrow road". King Zhao Huiwen decided to let Zhao Hao lead the army to rescue Yan He.

Zhao Haojun quickly set up camp thirty miles after leaving Handan, and did not move. He also ordered the army: "Those who dare to talk about military affairs will be beheaded," and they were stationed in the garrison for nearly 28 days, continuing to strengthen the defense of the camp in order to conceal the combat attempts of the Zhao army. The Qin army divided its troops into two routes, marching all the way to the west of Wu'an, beating drums and shouting, trying to lure the Zhao army to rescue Wu'an and clamp down on the Zhao army. Zhao Hao immediately killed a soldier who asked for the rescue of Wu'an, unmoved by the Qin army.

The Qin army sent a detailed work to infiltrate the Zhao military camp to find out the truth, but Zhao Hao pretended not to know, and ordered his subordinates to let him move at will to paralyze the Qin army. Qin Jun carefully reported the situation of Zhao Jun to Hu Yang. Hu Yang was overjoyed, thinking that the Zhao reinforcements only wanted to keep Handan, and they could capture it, so he relaxed his vigilance against Zhao Hao's support army. Zhao Hao then led the whole army to stop the drums, galloped for two days and one night, and rushed to build a fort and set up camp fifty miles away from the city and Yan. The Qin army, which was left behind in Wu'an, knew the plan and rushed to Yanhe to meet the battle as soon as possible. Zhao Hao adopted the suggestion of the sergeant Xu Li and sent 10,000 troops to seize the highlands of Yan and Beishan to occupy the favorable terrain. When the Qin army arrived at Beishan, they could not attack the mountain. Zhao Hao took advantage of the situation and condescended to attack the Qin army. The Qin army was not supported, more than half of the dead and wounded escaped, and returned defeated, and the Yan surrounded and relieved.

Fan Ju, a native of Wei, fled to Qin because he was persecuted by Wei Qi, the prime minister of Wei. When he arrived in the Qin State, Fan Ju made a statement to the King of Qin Zhaoxiang as a guest secretary, and proposed the famous strategy of distant and close attack to the King of Qin Zhaoxiang in view of the shortcomings of the Marquis Wei Ran who repeatedly led the Qin army to attack the Qi State across Han and Wei, and mobilized the troops but gained little gains. That is, to get close to Wei and Han with the method of envy and power, threaten Chu and Zhao, force Qi to take the initiative to attach to Qin after fear, and then attack Han and Wei near Qin to expand the land. King Zhaoxiang of Qin took Fan Ju's advice and launched an attack on the neighboring Han and Wei states.

King Qin Zhaoxiang ordered Wu Anjun Bai Qi to attack South Korea's Chengcheng, successively attacked nine cities including South Korea's Chengcheng, and killed 50,000 Han troops, and Bai Qi led the army to block the Nanyang Taihang Mountain Road. Bai Qi attacked the Korean Yewang again, cutting off the connection between Shangdang County and the Korean mainland. Shangdang County Shou Feng Ting had no choice but to surrender to Zhao State.

The state of Qin sent Wang Di, the chief of the left house, to lead the troops to attack Shangdang, intending to occupy it in one fell swoop. Zhao Guolianpo led 200,000 troops to rescue the party. Lian Po took the Bailishi Great Wall on the line from Danzhuling to Ma'angul as the main defensive position, divided the army to go forward 32 kilometers to build a forward defense on the line of Kongcangling, and sent the general to lead 5,000 Zhao soldiers to search and meet the enemy. At that time, the Wu clan, Lun, and Shangdang had been captured by the Qin army. Feng Ting led the remnants to join the Lian Po army. The first encounter between the Qin and Zhao armies took place in the Yuxi River valley, west of Kongcang Ridge. In the melee, the Qin army scouts beheaded Zhao Pi's general. After the initial battle was unfavorable, the Zhao army held the defense line of Kongcangling. The Qin army attacked and advanced to break through the defensive line, occupy the second city of the Zhao army, and kill the four captains. The Zhao army was forced to retreat and build a long fortification on the Dan River line west of the Great Wall of Shi. The Qin army once again attacked the position of the Zhao army, killed the second captain, and captured the western wall.

The Zhao army was defeated and retreated eastward into the old pass, holding on to the Great Wall of Bailishi. The Great Wall of Stone is built on the watershed from Danzhu Ridge to Ma'an Gully, and the southern slope of the mountain facing the Qin army is steep. The bottom of the stone Great Wall is 4 meters wide, there is a fortress built in the interval, it stretches for hundreds of miles according to the mountain situation, there is a natural pass in the middle section that is called the old pass, it is the only way for the north-south traffic, there is a city gate, and the Great Wall is integrated. The Zhao army deployed defenses on the entire Bailishi Great Wall, focusing on the defense of Guguan, Hanwang Mountain, and Daliang Mountain, and condescendingly resisted the Qin army. The Qin army's attack was frustrated, and the Zhao army was provoked to go out of the Great Wall for a decisive battle, but the Zhao army refused to fight. The 200,000 Zhao army under the command of Lian Po finally succeeded in containing the Qin army's offensive with a strong wall after losing many natural dangers.

There was no progress in the offensive, the war of attrition was stalemate, and both sides fell into food shortages, and it was difficult to supply food and baggage. The Qin army came from afar, the supply line was long, the logistics pressure was great, and the Zhao State was also short of food.

King Zhao Xiaocheng conspired with Lou Chang and Yu Qing, and Lou Chang asked for a heavy envoy to Qin Yu to make peace. Yu Qing believes that if he does not make peace, the Zhao army will be broken, so the decision of war and peace lies with Qin, and if he wants to force peace with Qin, he must not make peace with Qin: "The one who makes the concubine today is in Qin; Qin will want to break the king's army, although he will ask for a concubine, Qin will not listen. It is better to send an envoy to attach Chu and Wei with heavy treasures, and Chu and Wei accept it, then Qin suspects the cooperation of the world, and it can be done. "King Zhao didn't listen, so Zheng Zhu was married to Qin, and Qin accepted it. Yu Qing said to King Zhao: "The king must not be defeated and the army will be destroyed." How? The world's congratulations, the victors are all in Qin. Fu Zheng Zhu, nobles, King Qin, Ying Hou will show the world. When the world sees the king's concubine in Qin, he will not save the king; Qin knew that if the world did not save the king, he would not be able to succeed. "Moreover, the Qin State really took advantage of the opportunity of the Zhao State to send envoys to Xianyang for peace talks, and showed Zheng Zhu to show favor to Zhao, instead of Zhao Yuan. The other princes were afraid that Qin Zhao and Lian Heng would be disadvantageous to themselves, and did not dare to support Zhao.

Fan Ju of the Qin State also used anti-intermediary tactics to spread rumors in Handan: "What Qin is evil is, he is afraid of the horse suit Zhao Kuo, and he is quite easy to deal with, and he will be lowered." "Zhao Xiaocheng Wang Ben was angry that Lian Po led many casualties, and he was repeatedly defeated but stuck to the camp and did not dare to fight, and rumors spread everywhere, which was tantamount to adding fuel to the fire. So Zhao Wangli overrode public opinion, changed generals on the spot, and replaced Lian Po with the young general Zhao Kuo as the supreme commander of the Changping front.

Zhao Kuo replaced Lian Po and led another 200,000 Zhao troops to take over the military affairs of the Changping front. The Zhao army stationed in Changping has a total of more than 400,000 people, and the momentum is very huge. After Zhao Kuo arrived at the front line, he changed all the military orders and defensive strategic deployments, and replaced a large number of middle and lower-level officers, shrinking his forces and preparing to take the initiative to attack, in an attempt to annihilate the Qin army in World War I and recover Shangdang.

White up

After learning the news, the Qin State secretly sent Wu Anjun Bai Qi as a general to command the Qin army, and Wang Yi was reappointed as a deputy general, ordering "Those who dare to leak Wu Anjun as a general will be beheaded!" "In response to the dynamics of the Zhao army, Bai Qi relied on Changping on the east bank of the Dan River, and built a main position of 18 kilometers along the natural hill on the east bank of the Dan River, and the right flank extended to the north bank of the Xiaodongcang River to resist the attack of the main force of the Zhao army. In addition, 25,000 strange soldiers were arranged to cut off the retreat of the Zhao army attacking from the Great Wall of Stone after the decisive battle began; Another 5,000 cavalry blocked the connection between the Zhao army that remained at the Great Wall of Stone and the main force of the Zhao army.

The Qin army feinted, and the Zhao army was ambushed

Zhao Kuo, with little knowledge of the Qin army, commanded the main force to attack the Qin army troops stationed in front of the old pass. In accordance with Bai Qi's general orders, the Qin army was defeated shortly after the engagement, fled along the avenue leading to Changping, and lured the main force of the pursuing Zhao army to the preset battlefield.

Zhao Kuo did not know the plan and commanded the whole army to storm the Qin army's position, but the Qin army resisted stubbornly, and the Zhao army could not break through. At this time, the main force of the Zhao army was already twelve kilometers away from the old pass. The 25,000 Qin troops who had been ambushed on the north bank of the Xiaodongcang River suddenly attacked and occupied Hanwang Mountain, cutting off the retreat of the Zhao army. 5,000 cavalry also approached the old pass, so that the Zhao army left behind in the old pass did not dare to support. The Zhao army was completely divided into two sections. The main force of the Zhao army lost its logistical support, and the troops left behind did not dare to reinforce the troops with empty grain and grass. The Qin army seized the favorable situation and sent light soldiers without armor to attack the Zhao army from both flanks. The main force of the Zhao army was compressed by the Qin army in a low-lying valley between the Jiangjun Ridge and Hanwang Mountain, where the Qin army's defensive fortress was located. The Bailishi Great Wall, which was originally held by the Zhao army, was conquered by the Qin army, and instead became part of the Qin encirclement of Zhao.

Faced with the treacherous battle situation, Zhao Kuo ordered the troops to build a wall in place and wait for reinforcements. The Qin army took advantage of the situation to encircle the Zhao army in the valley. The news of the siege of Zhao Jun was reported to Handan. King Zhao Xiaocheng intended to join forces to resist Qin, and sent envoys to the neighboring states of Chu and Wei for help. However, due to the fact that the envoy of Zhao State entered Xianyang and negotiated with King Qin Zhaoxiang before, the vassal states were unwilling to save Zhao. King Zhao Xiaocheng had no choice but to send his own troops to the Changping front line to rescue.

When Qin learned that the main force of the Zhao army had been encircled and the grain route had been cut off, King Qin Zhaoxiang personally rushed to Hanoi County, gave all the county citizens the first rank, and ordered all men over the age of fifteen in the county to go out to support the Changping front line and block the Zhao rescue troops and food.

After being trapped and starving for 46 days, the Zhao army's war horses had evolved into a state of cannibalism, and the arrows and weapons were damaged and could not be replenished. In the end, Zhao Kuo led the elite to fight and break through in person, but was shot by Qin soldiers and hit dozens of arrows. In the end, the Zhao army lost more than 200,000 people, and the Zhao army was wounded, sick and starved and could no longer fight, so they had to surrender all. The Qin army captured more than 200,000 Zhao troops.

Be wary of 200,000 soldiers. Bai Qiji said: "The former Qin has been pulled out of the party, and the people of the party are not happy to return to Zhao for Qin." Zhao Zu repeatedly. If you don't kill them all, I'm afraid it will be chaos. Bai Qi appeased the soldiers with wine and meat, and pretended to promise to bring back to Qin the strong ones in the army, and the old, weak, disabled and young would be sent back to the Zhao State, and the Zhao people did not doubt it. Later, Bai Qi secretly ordered the Qin soldiers to wrap their heads in white cloth, and ordered that "anyone who has no white cloth on the head is a Zhao person, and he should be killed." "Zhao Guo's soldiers were not prepared, and they had no equipment, so they were killed overnight. Bleeding into a river, boiling like thunder" Only 240 young Zhao soldiers were released by the Qin army to Zhao to spread panic and deter the six countries of Shandong.

The news of the Qin army's killing of Zhao reached the Zhao State, and the whole country "cried for his father, father cried for his son, brother cried for his brother, brother cried for his brother, ancestor cried for his grandson, wife cried for his husband, and the streets were full of cities, and the sound of pain was endless."