Escorting Zan Wanshou back to Jiading was a reinforced special company led by Yu San, this company, in addition to the normal establishment and equipment, strengthened two light artillery squads, plus the remaining soldiers of Zan Wanshou Guard, a total of 150 people. The convoy only had five days of water to carry as much ammunition as possible, which meant that it had to rush back to Jiading within five days. Due to the detour, the distance of this line is about 200 miles. It was a challenge to march dozens of miles a day on a mountain road with a heavy load. Fortunately, the Perak Army's special forces have a great training intensity on weekdays, and they can barely reach it even if it is difficult.

Although Zan Wanshou was born as a scholar, he has been practicing martial arts since he was a child, and he is young, and he can barely keep up with him on foot empty-handed. On the other hand, Zan Manshou's guards carried less weight than the Thunderbolt soldiers, but they marched at a slower pace. Seeing this, Yu San asked Zan Wanshou for instructions, and he led eighty people with the best physical strength to escort Zan Wanshou first, while Hou Xing and Ding Company Commander took two artillery squads and the rest of the personnel to slow down. For this arrangement, Zan Wanshou naturally has no objection. Just as Ouyang Xuan was sending them off, the General Staff had sent information that the vanguard of the Meizhou army had marched towards Jiading by land and water. Although the news of Longzhou and Yazhou has not yet been returned, it is estimated that these two groups of people are already on their way to Jiading. At this critical moment, Zan Wanshou can stabilize the situation when he returns to Jiading City, and being able to advance one point means that the chances of winning are one point greater.

Three days later, Zan Wanshou returned to Jiading City in twilight under the escort of Yu San. After the news of his attack on Liu Da'er in Meizhou and his flight to Pengshan reached Jiading, the people in the city were panicked. Many wealthy families began to prepare boats, and if something happened, they would take a boat to flee to Chongqing, Luzhou and other places downstream, and many people were preparing their luggage to flee to the wilderness and mountains for refuge. Some generals in the city secretly liaise with the Meizhou army in order to join the new master in time. And many more soldiers and civilians were ready to hold the city, determined to resist the Mongols to the last man. When Zan Wanshou appeared in front of the gate of Jiading, there was a sound of cheers and thunder on the city wall, which meant that the Jiading defense battle had another backbone. Prior to this, the naval army of Meizhou had approached the waters of Jiading, and the Mongol cavalry had frequently appeared in front of the city.

Zan Wanshou's first order when he returned to Jiading City was to order someone to arrest the lieutenant general and colonel who secretly communicated with Liu Daer. Before leaving, Huang Dagen handed him a list, and the people on the list were all members of the secret Mongolian army detected by the Perak Army intelligence agency. Among these people who secretly communicated with the Mongolian army, there were generals guarding the city, naval personnel, and even clerks and staff in the government office. They had already made an agreement with Liu Da'er, and when the three-way army was encircled, if Jiading City refused to surrender, they would open the city gate and lead the Mongolian army into the city.

At this moment, there are 2,000 defenders in Jiading City, with a population of tens of thousands, and tens of thousands of people can be mobilized to assist in defending the city. The terrain of the two mountain cities of Sangui and Jiuding in the nearby Gongwei Jiading is extremely steep, and there are 500 defenders in each. It was mid-May when the summer grain had just been harvested, and there would be no shortage of grain before the autumn harvest. After taking stock, Zan Wanshou thought that it would not be a big problem to hold on until the arrival of the Perak reinforcements. If the Mongolian army is on the shore with ballista bows and arrows to help, the Jiading navy has more than enough to defend and not enough to attack, so it can only try to maneuver with the enemy under the cover of the city's firepower. After losing the advantage of the navy, it was difficult for Zan Wanshou to support the counties under Jiading with boats, and he could only rely on his stronghold. It's just that these county towns have few major generals, and it is really difficult to resist the attack of the Mongolian army.

The counties to which Jiading belongs are all on the west bank of the Minjiang River, except for Longyou County, where the government is located, the other four counties are different. At present, Cao Zhizhou led the Yazhou army to attack Jiading along the land and water, and will pass through Hongya County and Jiajiang County along the way, and these two counties will definitely fall into his hands. Liu Daer attacked Jiading by land and water, and did not send troops around the city to capture Emei and Qianwei counties. Jingyan County in Longzhou, which is currently under the administration of Jiading, is located on the east bank of the Min River, and is under the front of the New Gang Army. Fortunately, although the Mongol cavalry came quickly, they had no way to take the city, so they had to wait patiently for Hou Xin's annex army to attack the city. Seeing that the Mongolian army was strong, the generals defending the city took advantage of this gap to transport all the money and food of the people in the city to Jiading City. It is said that Jingyan County has been fighting for a long time between the Song and Mongolian armies, and the population in the city is only a few hundred, and there is not much food and money.

Two days later, Liu Daer led the main force of the Meizhou Army to Jiading City, accompanied by thousands of people recruited from various counties. No sooner had they set up their fortifications than they were driven to cut down trees to build siege engines. Zan Wanshou tried to order the defenders to go out of the city and attack the logging camp, but was stopped by Yu San. Sure enough, the reconnaissance of the special company who accompanied them brought back information that hundreds of Mongolian cavalry were hiding in the ravine behind the logging camp. Perhaps the logging camp outside the city was a decoy set by the Mongol army, which launched a surprise attack when the Jiading army was out of the city, and then followed the defeated army into the city.

In fact, Liu Daer had already built a lot of trebuchets, ballistas and other siege equipment, and this time he had already let the naval ships transport them. After these siege equipment are assembled, they will be accompanied by a small number of imitation artillery, some of which will be used for siege and the other part will be erected on both sides of the river to assist the Meizhou naval army. At this time, most of the Mongol cavalry and new annexed troops of the New Wing were still on the east bank of the Min River, and only some of them arrived at the city of Jiading on the west bank by boat. The cavalry ambushed behind the logging camp were the first to come to the New Moon, about 500 men and 1,000 horses, who hid in the ravine not only to raid the Jiading army, but also to escape the scorching sun in May.

Although he set up a large camp under the city of Jiading, he was not in a hurry to attack the city, and did not even launch a trial and control attack. In addition to the reason that the siege equipment was being assembled, it was also because Cao Zhizhou had not yet arrived, and there were still 5,000 new troops waiting to cross the river on the east bank of the river. The main force of the Meizhou Navy had to confront the Jiading Navy and could only use a small number of boats to cross the river. Therefore, although the transportation was carried out day and night, the progress was not satisfactory because it was necessary to transport not only soldiers but also a large amount of logistical materials. He ordered the construction of a pontoon bridge, but was told that during the rainy season, the river was too wide and the water was too difficult to build, and the pontoon bridge that had been built so hard was easily washed away by flash floods.

In the past few days, the Jiading Navy saw that the ships of the Mongolian army frequently traveled back and forth on both sides of the Min River to transport supplies, so they constantly sent ships to attack. Zan Wanshou's idea was to delay the progress of their transportation, even if they could not destroy the Mongolian army's water passage. It's just that because the Meizhou naval army occupied the upper reaches, and there were Mongolian trebuchets, ballistas, artillery and other siege weapons on both sides of the strait, the attack not only had no effect, but damaged many soldiers and ships, and was even suppressed under the city by the Meizhou naval army.

The situation on the water returned to equilibrium with the arrival of two small firearms units of the Thunderbolt Army. The first is the three armed merchant ships that saved Zhan Wanshou on the way to take office. After sending Zan Wanshou back to Jiading, because the situation in Jiading was unstable, especially for fear that someone in the navy would secretly communicate with Mongolia, Yu San let the three ships still hide in the reeds. After Yu San returned to Jiading with Zan Wanshou, he immediately sent people to recall the three armed merchant ships. The second is the two light artillery squads led by Hou Xing and Ding Company Commanders. As they got closer to Jiading, the more frequent the Mongol cavalry became, and it took them two more days to reach safely.