As a veteran general who has been in the army, Niu Lin knows that there is not much food, grass and ammunition for the Thunderbolt army under Fushun City. Under the harassment and resistance of the 2,000 cavalry, although Hou Xing fought steadily and steadily, he did not give the Mongolian cavalry a chance to take advantage of it, and successfully reached the city of Fushun, but since then there has been no logistical supply.

Cavalry is the king of war on land, and the 3rd Division is not capable of ensuring the safety of the grain routes on land under the threat of 2,000 cavalry. Fighting a war is fighting logistics, which is also the reason why Niu Lin dares to use human lives to consume ammunition, and without ammunition, the artillery of the Thunderbolt Army has become an ornament. Food is more important than ammunition, and the Mongol army only needs to wait for a while, and when the Perak army in Fushun City runs out of food, it can easily achieve victory.

It's just that time is not on the side of the Mongolian army. In addition to Zan Wanshouzheng leading the army towards Fushun, the situation of the Mongolian army in the direction of Zizhou was not good. According to the military information reported back by Baijianu, although Cao Ergou did not rashly open fire, so as not to accidentally injure the women, children, old and young at the head of the city, he adopted the method of step-by-step camp, under the protection of artillery, the camp approached the Zizhou city wall, and now has surrounded the north, west and east three gates, if it goes down according to its progress, within ten days, the Zizhou city can be encircled.

During the siege of Zizhou by the 1st Division of the Perak Army, Kudu also led the cavalry to try to raid the Perak Army, which had built a camp, but hundreds of horsemen were killed and wounded under the artillery. After this battle, no matter how urged by the hundred slaves, they were unwilling to lead the troops into battle, and were only willing to go to collect grain and grass and plunder the people, and did not resist being the overseers. Suffering another crushing defeat under artillery deepened his fear of the Thunderbolts.

The military situation of Baijianu made Yu Xuan understand that Zizhou was afraid that he would not be able to hold it. If Cao Ergou comes again, once he joins forces with Zan Wanshou to Fushun City, he will definitely be more auspicious. To prevent this from happening, the best way is to eat the Thunderbolt army in front of you, hold the pontoon bridge on the Tuojiang River outside Fushun to the east of Sichuan, and then wait for the opportunity to use the advantage of cavalry to attack the rear of the Thunderbolt army.

In order to achieve the above goals, it is extremely crucial to eliminate the current Thunderbolt army, otherwise the Mongolian army will be surrounded on three sides, and the only way to escape to the east of Sichuan is through the pontoon bridge outside the east gate. The pontoon bridge was built as soon as Niu Lin arrived in Fushun, which is not only a grain and grass transportation channel, but also the only channel for reinforcements from eastern Sichuan, and a way to escape at a time of crisis.

In order to ensure the safety of the pontoon bridge, the Mongolian army drove a large number of thick wooden piles and sank a large number of bamboo baskets loaded with stones in the river several miles upstream and downstream of the pontoon bridge. The lesson of the Battle of Jiading was that as long as the Thunderbolt artillery ships were blocked, there was a half-chance of victory. The other half of the odds were for the cavalry to rush into the infantry before the field artillery was deployed.

As the reinforcements led by Zan Wanshou got closer and closer, the Mongol army's offensive became more and more fierce, and they did not drive civilians to attack with them. On the one hand, around the pontoon bridges in and outside the city, a large amount of labor was required to dig trenches and build earthen walls. On the other hand, the task of using human lives to consume the ammunition of the Perak Army has been completed, and continuing to drive away these civilians running around will involve the energy of the Mongolian army, and it will affect the offensive formation.

The main force attacking the camp was naturally the new annex army, which besieged from three directions: north, south and west - the east side of the camp was close to the Tuojiang River. Due to the fact that in the early battle, the thunderbolt army's mines and triangles had long been exhausted, and there were not many grenades left, and without these defensive weapons, the new annex army rushed out of the trench and rushed straight under the camp wall. The two sides began to engage in hand-to-hand combat across the earthen wall, and the sound of killing shook the sky for a while.

Generally speaking, the battle situation is still dominated by the Thunderbolt army, in addition to the advantage of waiting for work at leisure, it is also because of the advantage of the camp and earthen wall. The earthen wall, though just over a man high, required short ladders and ropes to climb up, and the new recruits were exposed to condescending spear stabbing and musket fire from the Thunderbolts.

In the process of climbing, the soldiers of the new annex army would occasionally have sporadic grenades falling from the top of their heads, and a large area would be blown down in an instant. In order to maximize the lethality of the remaining grenades, the defenders often threw them when the soldiers of the new annex were crowded together, often killing more than a dozen people with a single grenade. In fact, the Thunderbolts still had dozens of shells, but Hou Xing did not order them to be fired. This shell was used as a siege weapon against the Mongol army, or at the most critical moment.

The new annex attacked fiercely, and the Thunderbolts defended tenaciously. After a few days of siege, although both sides suffered heavy casualties, the fighting still revolved around the earthen wall, so that the soil under the root of the earthen wall was soaked with blood, and the walls were also splattered with blood. Although the new annex army attacked the earthen wall several times and occupied a section for a short time, it was driven back by Hou Xing with the reserves.

The so-called "one blow of strength, and then three declines and exhaustion". The long-term inability to attack has caused the morale of the new annexed army to be low, and the offensive momentum is declining. This made Niu Ling furious, and he killed several generals who took the lead in retreating, but he couldn't restore the fighting spirit of the new annexed army. It is no wonder that the soldiers of the new annex army are unwilling to continue to come forward to fight for fame, since the battle of Fushun has begun, the casualties of the soldiers of the new annex army have reached more than 2,000, and the casualty rate has exceeded 30%. On the other hand, although the Perak army suffered heavy losses, the total number of casualties was less than 600, including more than 200 basic militiamen.

Just when Niu Xuan was furious and anxious, Liu Heima died. He was ill in the battle of Jianzhou due to anger, and after being escorted to Zizhou by Liu Yuanli, he had not recuperated for a few days, and the Thunderbolt army arrived again, so he had to continue to Fushun City. Liu Heima had fallen into a sickness after many years of fighting, and after losing Chengdu, he lost Jianzhou, which made him even more depressed, and he continued to run and flee under the pursuit of the Thunderbolt army, and he actually went under an illness.

"Knowing the father Mo Ruozi", Liu Yuanli and Liu Yuanzhen, who retreated from Shenjian City to Fushun with Niu Ling, knew that the reason why his father refused to turn a blind eye was that he regarded losing to the Thunderbolt Army as a shame for his life, so he attributed the cause of Liu Heima's death to Cao Ergou and the Thunderbolt Army, and vowed to take revenge. Enraged, they asked Nulu to lead an army to attack the fortification, to comfort their father's spirit in heaven with a great victory.

Liu Yuanzhen and Liu Yuanli asked for it, and Niu Ling naturally agreed. Regarding Liu Heima's death, he was happy in his heart. The Mongolian military aristocracy such as Niu Ling has always looked down on Liu Heima and other northern Han military princes, but these people have the support of Kublai Khan and are quite powerful themselves, and they can't help them at all.

During the period of western Sichuan and retreat to Jianzhou, Niu Ling and Liu Heima had constant friction due to different political views, but Liu Heima was quite favored by Kublai Khan, and it was often Niu Lin who was reprimanded, so that his heart was resentful. Now that Liu Heima is dead, the power of the Mongolian army in central Sichuan will fall into the hands of Niu Ling, how can he not like it? At present, no one is willing to seize the camp, so Liu Yuanzhen's brothers took the initiative to ask for help, which is exactly what Niu Lin wants. If you win, it will be a good thing, and if you lose, it will cure the sins of these two brothers.

After the defeat of Jianzhou, Liu Heima's subordinates were completely lost, Liu Yuanli only took a few hundred soldiers and horses, plus Liu Yuanzhen's personal entourage brought back from Shenjian City, the total strength was less than 1,000 people, and it was obviously impossible to rely on this number of men and horses to build a camp. Therefore, Liu Yuanzhen signaled Liu Cheng again, asking him to ask Niu Ling for orders to attack the camp together, but Liu Cheng refused to obey his orders, which made Liu Yuanzhen and the two resentful.

In Liu Yuanzhen's view, when Liu Cheng asked for surrender, the Mongolian army thought that it was a fraudulent surrender, and it was Liu Hei Ma who overrode public opinion, first sent himself to Shenjian City to assist in the defense, and then urgently reported that Kublai Khan ordered Niu Xuan to assist Liu Quan. Now Liu Quan's refusal to send troops together is really ungrateful. Of course, Liu Quan understands Liu Heima's kindness to him, but he is a rebellious three-surnamed domestic slave, and he knows very well the strength of the Thunderbolt army, and knows that even if he captures the camp, he will suffer heavy casualties. After the battle of Divine Arm City, there were only a thousand of his soldiers and horses left, and there would be any more losses there?