The Northern Song Dynasty court divided Sichuan and Hanzhong into Yizhou Road, Zizhou Road, Lizhou Road, and Kuizhou Road, which were called "Sichuan Gorge Four Roads", of which Yizhou Road was also called Chengdu Fu Road, which was the strongest among the four roads. After Huang Dagen took Han and Peng, only the Mianzhou and Shiquan armies in the north and Jianzhou and Longzhou in the east were still in the hands of the Mongolian army. It's just that Ouyang Xuan clearly realized that after the two successive battles of Jiading and Chengdu, the Thunderbolt Army consumed a lot of weapons and ammunition, and the soldiers were extremely tired, and it was no longer suitable to continue fighting, and more importantly, the three consecutive months of fighting had had a great impact on the economy and society in the rear, and they urgently needed to recuperate.

How to stabilize the situation in the newly recovered Chengdu Prefecture, Pengzhou, and Hanzhou is the top priority. There are 17 counties in these three places, with an official registered population of about 150,000, and if we take into account that Penghan Prefecture is also half-mountainous and half-dam like Chongzhou and Qiongzhou, plus the Longquan Mountains along the Tuojiang River, it is estimated that there are at least 100,000 hidden populations. With the addition of the above prefectures and counties, the Thunderbolt Army currently occupies a total of seven states, with a population of about one million under its rule, and is already a major force in Sichuan. At present, in addition to the two major forces of the Mongolian army and the Song army, there are many large and small semi-independent forces in Sichuan, the largest of which are the Thunderbolt Army and the Banzhou Yang clan, which have formed an alliance, and it seems to have become the third largest force in Sichuan. This is also the first time that Ouyang Xuan had the confidence to send people to Chongqing and Lin'an to report his exploits after the Battle of Chengdu. The retribution is only superficial, but in essence, he told Yu Xing and the ministers of the court that the land in western Sichuan was taken by the Thunderbolt army alone, and he didn't want to do anything again.

According to the Southern Song Dynasty's consistent urine habit of treating heroes with "rabbits and dead dogs, and birds hiding their bows", seeing that the Thunderbolt army was so powerful, it would inevitably adopt the art of checks and balances, and even sent people to take over the newly recovered land. Even if Li Kaipeng, according to Ouyang Xuan's instructions, stepped up his lobbying efforts in Lin'an to get Jia Yidao and others, Yu Xing would not have seen the Thunderbolt Army monopolize the land of western Sichuan. Yu Xing is not only greedy for money, but also very jealous of his ability, Liu Heima, who has repeatedly beaten him, was easily driven out of Chengdu by Ouyang Xuan, which is simply slapping him in the face, which highlights his incompetence. The Thunderbolt army had to prepare in advance to prevent Yu Xing from secretly making a loop.

If you want to talk about the tree, the strength of the Thunderbolt Army in the Battle of Chengdu has attracted Kublai Khan's attention, but at the moment he is fighting with Ali Buge, and he can't spare his hand to deal with the Thunderbolt Army for the time being. However, not launching a large-scale military operation does not mean that the Mongol army will give up, Liu Heima and Kudu, who have retreated to Tongchuan and Jianzhou respectively, will definitely wait for an opportunity to take revenge, and the Mongol troops stationed in northern and central Sichuan will also join forces with them. In addition to nearly 10,000 Mongolian cavalry and Mongolian Han infantry troops, there are tens of thousands of new annexed troops, the strongest of which are the Mongolian Han army of Lizhou Wang and the new annexed army of Yang Dayuan. After Wang Dechen died in the Diaoyu City, his son Wang Weizheng inherited his position and grew in power. Yang Dayuan was the former commander of the Song army in Langzhou, the general of the city of Dahou, and after the surrender of the city, he was entrusted with the important task of the Mongolian army to lead all the new annexed troops in the central Sichuan area.

In order to deal with the threat of the Mongolian army, the top brass of the Perak army unanimously decided to expand the army. Originally, the territory of the Perak Army was only two or three hundred miles in radius, and thousands of regular troops plus the basic militia were enough to meet the needs of defense. After the Battle of Jiading, the area under the jurisdiction of the Perak Army was expanded to a radius of six or seven hundred li, and the original troop strength and military management system could no longer meet the needs. Therefore, the General Staff Department put forward a new plan for expanding the army in accordance with Ouyang Xuan's ideas. According to the new plan, the regular army of the Perak Army was expanded into three field divisions, a brigade directly under the General Staff Department, and a mountain brigade, with a total strength of more than 25,000 personnel. Each field division has two infantry brigades, one cavalry brigade, and one naval brigade, as well as a division headquarters battalion, a special battalion, and a reconnaissance battalion, with an establishment of 7,500 personnel. The headquarters of the 1st Division is located in Chengdu, with Cao Ergou as the division commander and Le Quanan as the deputy division commander, responsible for the defense of Chengdu Mansion and Genting City; The headquarters of the Second Division is located in Hanzhou, with Huang Dagen as the division commander and Dong Hu as the deputy division commander, responsible for Peng and Han Prefectures; The headquarters of the Third Division was stationed in Jiading, with Zan Wanshou as the division commander and Hou Xing as the deputy division commander, responsible for the war in Meizhou and Jiading.

The mountain brigade is responsible for the defense of the two prefectures of Dajian and Weimao, and has two reinforced battalions and one mobile battalion, each battalion has three infantry companies, one special company, one cavalry company, and one reconnaissance company, with an establishment of 600 people, and the brigade commander is Shi Zhongshu. Both directions are high mountains and valleys, and it is not difficult to hold either direction with a small number of troops to garrison forts and strong strongholds, and with allies and caravans along the way, it is not difficult to hold in both directions. Even if it is infiltrated by a small group of enemies, it is protected by the two fortresses of Baizhang City and Guan Kou Village, and it cannot pose a threat to the core area of the Perak Army at all. As for the troops directly under the General Staff, in addition to the original 500 troops, two additional cavalry battalions have been set up as strategic mobile units, which are under the direct command of the new chief of staff, Zeng Yong.

The above plan only adjusts the establishment and management system of the armed forces, and does not mean that the armed forces will be ready to become an army immediately. As a matter of fact, the pace of expansion of the Perak Army this time is too great and there are too many difficulties, and many troops and equipment can only stay on paper in the short term. At present, the actual number of soldiers in each of the newly established units is less than half or even less than the strength of the establishment, and the equipment of artillery, horses, and guns is even worse. Take Cao Ergou's First Division as an example, there is only one infantry brigade at present, the cavalry and navy only have one battalion, and the second and third divisions have fewer actual personnel and establishments. With the exception of three field divisions, the situation with the rest of the troops was similar. According to Ouyang Xuan's estimates, even if everything goes well, it will be a year before the above-mentioned expansion operation is completed.

In the expansion of the army, the source of troops is not a problem. At present, the Thunderbolt army has a population of one million, and it can train 100,000 militia according to the ratio of 1 to 10. It's just that Ouyang Xuan has always emphasized taking the line of elite soldiers, and in line with the principle of preferring lack to lack to indiscriminate, he has very strict requirements for regular army soldiers. In addition, firearms, especially artillery, are also high-tech weapons, and training also takes a certain amount of time, so even if the Perak Army conducts intensive training for the current 20,000 basic militia, it will take three months to form combat effectiveness. As for weapons and equipment, it is a headache, spears, shields, rattan armor and other cold weapons are the best solution, grenades, mines can also be quickly installed, but muskets, artillery, warships and horses can not meet the demand in the short term. In particular, the two main battle equipment, artillery and war horses, are not only expensive, but also limited by production capacity and sources. Ouyang Xuan had ordered the arsenal to run at full capacity, and ordered the caravan to increase the purchase of war horses, but with such a huge demand, there would not be too many troops to equip in the short term.

In view of the above difficulties, Ouyang Xuan did not have many good ways, so he had to increase the construction of fortresses and strongholds, continue to implement the mode of integrating farming and warfare, train a large number of militia as guards and auxiliary troops, and let the regular army full-time field combat. To this end, the joint meeting proposed that the army should focus on defense within a year, still use the river controlled by the navy as the chain, and take the fort of fort as the lock, and use the superiority of the navy and the fort to give the Mongolian army a head-on attack, so as to stop the invading enemy from outside the jurisdiction. Of course, offense is the best defense, and you can also send a small number of special forces to harass the enemy on weekdays, and you must also see the right time to surprise the Mongolian army in the confrontation.