When a large number of Mongolian cavalry came to help, the Perak army had already cleaned up the battlefield and retreated to Guankou Village. Faced with the scorched earth barracks, the Mongolian generals were extremely angry. It's just that in the face of the high walls and artillery of Guan Kou Village, he had to lead his troops to retreat. After the Mongolian army retreated, Cao Ergou also led two infantry battalions of the field brigade back to Qiongzhou City. Before that, the cavalry battalion of the field brigade had already gone to Pujiang first. The reason why they were in a hurry to return to Qiongzhou was because the special battalion of the Internal Guard Brigade had made new moves in Danling and Pengshan counties in Meizhou, and Ouyang Xuan ordered them to go to Pujiang in case of accidents. As for the defense of Guankou Village, there is no need to worry, the checkpoint and the wall are unbreakable after being reinforced, and under Ouyang Xuan's order, artillery ammunition has been transferred first, and a lot of mines have been laid. Even if the Mongolian army fills it with human lives, it will be difficult to capture a village and a pass that is armed to the teeth.

Pengshan County, which was controlled by the Mongol army, was bordered by Pujiang County, which was ruled by the Perak Army, and the two sides faced each other across the Pujiang River, with the terrain on the north bank of the river mostly plains and the south bank mostly hilly and low mountains. This Pujiang River is a tributary of the Nanhe River, and it is far inferior to the Nanhe River in terms of river width and water volume, nor is it as good as the Xiejiang River, another tributary of the Nanhe River. The Chengdu Plain has abundant currents, and although the Pujiang River is not very wide, it has no problem sailing on weekdays, and even the gunboats of the Perak Army can move freely. Only in the dry season in winter, only small boats with shallow drafts can be allowed. Since the beginning of winter this year, the drought in western Sichuan has also reduced the water of the Pujiang River a lot, and a large area of shallows has been exposed in the river, and many places can even wade through. Some time ago, the cavalry of the Mongol army raging in the territory of the Perak army waded through this river.

As a key node of the southern line of defense of the Perak Army, Pujiang City is located on the north bank of the Pujiang River, and its position near the water can not only defend against danger, but also facilitate the activities of gunboats and transport ships. On the disadvantage, the hilly and low mountain areas on the south bank of the river were devastated by the Mongolian rangers due to the retreat of Yu Xingbu without a fight. In fact, Yu Xing is not to blame for this, the area is divided into Pengshan and Danling counties, far from Jiading and Meizhou, and the supply line is long and easily cut off by the Mongol cavalry. If there are few troops stationed there, they can't hold it at all, and if they want to hold it, they must send heavy troops to defend it. Yu Xing is now unable to even take the important city of Meizhou, and it is impossible to send heavy troops to defend this barren hilly area. On the other hand, although the Mongols had a small garrison in Pengshan, they relied on the mobility of their cavalry and controlled the area with only a small number of cavalry.

During the Battle of Jiading, the special battalion used this area to attack the Mongolian army in Pengshan City and Meizhou, and also brought tens of thousands of refugees to the Perak Army through this area. After the Battle of Jiading, the retreating Mongol army tried to regain control of the area, sending a large number of cavalry and new annexed troops to try to kill the special battalions that were still operating here. Because the Mongolian army controlled the traffic road and the fortress of the mountain dam, and relied on its rapid mobility, it had an absolute advantage in logistics and supply. On the other hand, although the special battalion has good combat effectiveness, it is faced with the weaknesses of eating and sleeping in the open and having difficulty in supply. Although this is not a big problem in a short period of time, it will seriously weaken the combat effectiveness of the special battalion in a long time. If you don't want to give up the area, you have to think of a perfect way to stick to it for a long time.

When the military-political joint meeting discussed the matter, Le Quanan spoke on behalf of the naval brigade - Huang Dagen was suspended, and he was replaced in the joint meeting. Le Quanan first reviewed the failure of the naval army to block the river, and then put forward his own idea - to build a fort and lock the mountain. In Le Quanan's view, the Pujiang River is a short board of the naval army's defense, and the Mongolian army can directly approach the core area of the Perak army after crossing the river. To solve the problem of winter dry defenses, it was necessary to establish a buffer zone on the south bank of the Pujiang River to delay and deter the Mongol cavalry. The best way is to build forts at various dangerous junctions and hills, and with a small number of troops can lock up this hilly and mountainous area. In addition, although this area is sparsely populated, there are many resources, and if it can be controlled and developed, it can completely make up for the expenses and even have a surplus.

Ouyang Xuan completely agreed with Le Quanan's idea. During this period, although the special battalion exhausted the Mongolian army by ambushing and night raids, and killed and wounded hundreds of enemies, it was also exhausted. Although there were few casualties in the fighting, many fell ill due to exhaustion and malnutrition, and the non-combat attrition was severe. Compared with the damaged and consumed weapons and ammunition, what is more important is that the special battalion, the main force of guerrilla warfare, is firmly contained in this area. If the strategy of building forts and locking mountains is successful, this area can be defended with second-line troops, and even the method of combining farming and warfare can be used, with the people to form a militia, with a small number of regular troops can be controlled.

"The essence of fighting a war is to fight the economy" is the consensus of the top level of the Perak Army. The reason why Ouyang Xuan agrees with Le Quan'an is not only because this is the least expensive and most sustainable method, but also because of political considerations. After the Battle of Jiading, Yu Xing wrote a letter demanding the return of the Meizhou refugees, completely ignoring the fact that Meizhou City and Pengshan City were still in the hands of the Mongol army. Now let these refugees go back to Meizhou, even if they go to places like Qingshen and Danling, the refugees are afraid that they are unwilling. Before the Mongol army abandoned these places, they set fire to the two cities and burned them to the ground, how can the refugees live when they go back? Yu Xing is greedy, and his subordinates are also doing the same, and they are not as good as the Mongols in oppressing the common people, where are the refugees willing to go back.

Ouyang Xuan is ready to mobilize Meizhou refugees to settle down in this area. On the one hand, this is in response to Yu Xing's request, after all, these refugees have indeed returned to Meizhou, and on the other hand, it is also in response to the call of some refugees, who have been inseparable from their homeland since ancient times. "Shu people guard the Shu soil", from a military point of view, this is also an effective way to fully stimulate the combat power of the local people.

After the strategic direction was determined, the next step was the implementation path and tactics, and everyone at the joint meeting expressed effective opinions. The main principles are as follows: First, the Changqiu Village is fortified thirty miles southeast of Pujiang City. There are more than 30 households and 100 people in this Changqiu village, built on a flat-topped mountain, surrounded by steep cliffs, although only more than 20 meters high, it is also easy to defend and difficult to attack. Before the Perak army entered the area, it had fought several Mongol attacks on its own. It's just that due to the lack of manpower and the rudimentary weapons, it has long been precarious. After the special battalion came to Changqiu Village, it completely ruined the Mongols' idea of seizing the village with firearms, and also had a place to rest in the local area.

The second is to take Changqiu Village as the center, and gradually extend the reclamation point to the east and south. At the heart of these settlements are the courtyard houses protected by high walls of moats, and the four corners of the courtyards are fortified towers, the Thunderbolt version of the watchtowers of the Tibetan district. However, due to the lack of stone, the tower was built of fired green bricks and cement mortar. In order to attract refugees to settle for settlement, the military-political joint conference decided that all five miles of land around the courtyard would be owned by the tun people, except for minerals.

The third is the issue of materials for the construction of forts. The construction of Changqiu Fort required a large amount of cement and artillery, which were first transported to the Pujiang River by water, and then carried to Changqiu Fort by mules and horses along the mountain road. Some of the materials needed for the rest of the reclamation points need to be transported through Changqiu Fort, and some are taken locally, such as the green bricks required by the reclamation points need to be fired in kilns.

The fourth is the issue of safety during construction. In order to prevent the Mongol army from attacking, in addition to the special battalion continuing to attack and harass the enemy, another battalion of the garrison brigade was assigned to garrison Changqiu Fort, and the task of the cavalry battalion of the field brigade was to protect the smooth transportation route. As for the two infantry battalions of the field brigade, they will be led by Cao Ergou to be stationed in Pujiang City, and as soon as the Mongolian army makes any changes, they will go south to reinforce them.