If we ignore the Hebei Plain in the south, Yanjing Road can be said to have a relatively complete defense line: surrounded by mountains in the northwest and blocked by sea in the southeast. Therefore, the existence of Tanggu is a great threat to Yanjing.

Since the old Liao period, Yelu Dashi has built a city wall on the periphery of Tanggu, and this fan-shaped city wall was later occupied by the Han army, and instead became the outer city wall of Tanggu. After the Jin and Han wars, the Jin army set up a longer semi-circular encirclement on the periphery of Tanggu, besieging the new city of Tanggu along with Tangnan, when the Jin army benefited, this encirclement was the rear defense of their attack, and when the Jin army was unfavorable, this encirclement became the barrier of the Jin army's defense. After the Han army's victory in the northeast, the Jin army added considerable troops to this encirclement, but at this time it was not for attack, but for defense.

In addition to Tanggu, the Yuguan in the east of Yanjing, the Gubeikou in the northeast and the Juyongguan in the northwest are quite dangerous to defend, and now the Han army can bypass the Yuguan and communicate directly with Pingluan by sea, so the Yuguan will survive although it is still dead. The strength of the Jin army was insufficient compared to the Han army at this time, and as soon as there was a flaw in the defensive circle around Yanjing, it would be like the Yellow River bursting its embankment out of control.

At this time, the Ping Domain in the east and north of Yanjing had been lost, and the Northeast Army knew that there was a guarantee for planting and going to the sick place, and it was pouring down desperately, no longer scrupling as before. The strength of Yinshu can be weaker than that of Xiao Tienu, and it is no longer possible to stop it on the periphery, and the disadvantage of Gubeikou is even more obvious. Luxian in the east of Yanjing and Huairou in the west are not strong strongholds with natural dangers, once the northeast army and the Pingluan army will join forces, Zonghan Zongfu can only use the walls of Yanjing to resist Zheyanchong and Xiao Tienu.

At this time, Han Fang's previous strategy of attacking the heart played a role, countless Han Khitan officials saw that the Jin army was gone, and they flattered the Han army to surrender to Cheng, planting diseases from Pingluan all the way to just occupy the main road of transportation, after a large number of officials surrendered, even with Yuyang to Luanzhou more than a dozen counties are changed from Han, that is, Fanyang and Zhuozhou, which are in the southwest of Yanjing Road, have also begun to appear unstable. This scourge of fluctuating hearts and minds is sometimes more terrible than an external military threat.

Han Qi was afraid of death first, and when he heard that Xiao Tienu had broken through Gubeikou, he first suggested that the encirclement of Tanggu should be revoked, so that this army could return to defense, and first defend Yanjing. Zong Han couldn't help but be quite moved when he heard this idea, the soldiers and horses besieging Tanggu were not only very numerous, but also had several strong teams that were good at fighting, if this army of soldiers and horses was mobilized, it would be a very strong combat force.

The people and horses besieging Tanggu are mainly the Eastern Route Army, and it is not that Zong Han can be counted if he says it, so this matter has to be discussed with Zong Fu, and Zong Fu was furious when he heard it: "As soon as the soldiers and horses in the southeast are withdrawn, will Yang Kaiyuan stay in Tanggu obediently?" If Yang Kaiyuan is allowed to come up to join the teacher, I'm afraid we will really be defeated! ”

Zong Han actually knew that this was to quench his thirst, but he also knew that it would be difficult to rely on the defenders of Yanjing, Huairou, and Luxian to block the hundreds of thousands of troops of Zhe Yanchong!

"Marshal Du, Yanjing can't hold it!" Zong Han's chief strategist Gao Qingyi said: "For today's plan, the only way to do this is to retreat to Yunzhong and join Xia to resist Han, otherwise the first army from the north will go south, and then it will be too late for us to leave!" ”

Retreat into the clouds? If this is really done, then the Jin army may not even have a chance to fight against the Han army from now on, so it can only resist stubbornly, but does Zong Han still have a choice? The current Zong Han is no longer the majestic Zong Han who broke Taiyuan and went down to Bianliang, and the current Zong Han is already a sunset chief who will go to the same fate as the Liao lord Yelu Yanxi at any time under the threat of Zhe Yanchong! For him, the most urgent consideration at this moment is not to compete for dominance, but how to save his life.

Walk? Or not to go?

When Zong Han was hesitating, Zong Fu was also wondering if Zong Han would persevere.

"Will Sticky Han stay?"

Sosuke wasn't sure, because even he felt that the possibility of holding Yanjing was very slim. At this time, the Han army had not yet taken Yanjing directly, because they were waiting for Xiao Tienu to come to meet the teacher, but the soldiers and civilians in the city were already panicking. From the day the news of the westward expansion of the disease reached Yanjing, people kept coming to tell the truth, saying that this Hanchen had collusion with the Han Ministry, and that the Khitan was the internal response of the Han Ministry. But Zongfu didn't dare to move these people easily without definite evidence, not because Zongfu was strict in abiding by the law, but because these defendants sent Wenchen military generals were too wide, and if they were really thoroughly investigated, I was afraid that before the Han army could attack, Yanjing City would be in civil strife first!

"Yanjing can't hold it." Sosuke thought.

On the same day, he issued a secret order, requiring all the generals on the periphery of Tanggu to directly listen to Zong Bi's moderation, and hinted to the generals: If Zong Han abandoned Yanjing and fled west, he would immediately withdraw the siege of Tanggu to join Zong Bi's main force. In any case, Sosuke hopes to leave as much vitality as possible for the second room, as the capital for future turnovers - although he doesn't know how many chances they have to turn over.

In May 1682, the main force of the Northeast Army arrived at Gubeikou, and the minister of the army, Han Fang, was even in Bei'anzhou, but Xiao Tienu immediately sent five light cavalry teams of 1,000 people to attack in all directions, or go straight to Yanjing, or harass Huairou, and one even made a gesture to seize Juyong Pass. All of a sudden, there were traces of the Han army everywhere inside and outside Yanjing, and even Yinshu couldn't figure out where Zhi Yanchong had gone.

"Marshal Du! Yanjing can't hold it! Gao Qingyi persuaded: "If we really let Xiao Tienu take Juyong Pass first, then it will be too late for us to leave!" ”

At this time, the weather has gradually become hotter, Mobei, Jurchen tribes are quite tired, but the Han soldiers in the Han army are much less affected, there are many soldiers from southern Liaoning in the northeast army, and there are also many Shandong soldiers transferred from Tanggu under the command of the sick people, the weather in April and May is not enough to make them feel too embarrassed, but many Jurchens have been dizzy, even Zong Han is also very irritable, irritable not only the successive unfavorable war reports, but also this damn weather!

"Good weather!" Yang Yingqi fanned his fan while thinking: "Do you want to persuade the third brother to organize an army and take advantage of this weather to attack?" However, in the end, he still didn't go to Yang Kaiyuan to say more, because this was already a tactical matter, and it was not appropriate for him to overstep his bounds.

In fact, Yang Yingqi didn't say it, some generals also began to persuade Yang Kaiyuan to do it, but Yang Kaiyuan was still a little hesitant, in order to maintain the supply of Pingluan all the way, Tanggu mobilized considerable manpower and material resources, and now the regular defense army in Tanggu City has been greatly reduced, Yang Kaiyuan thinks that Tanggu's troops are close to the danger line, so he doesn't think it's a good idea to go out of the city to invite attack. He believed: "As long as we wait for the Northeast Army to fully enter Yanjing Road, the encirclement outside Tanggu will be self-defeating, and we don't need to take risks." At this time, Yang Kaiyuan didn't know that Zong Han was already preparing to retreat west.

Zong Han retreated westward, not only because the defense line in the east and north had been broken, but also because there was also a warning signal from the west: Yelu Dashi Xingbing of the Western Liao regime had come to take revenge!

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