A few days later, the widow's cliff. Huang Dagen stood silently at the top of the hill, a huge amount of gunpowder had been planted on the embankment of the dammed lake below, and several Perak soldiers were checking the gunpowder fuse for the last time. This morning, he received a message from the Perak Army headquarters that the plains below Guan Kou Village were ready for flood control. A few days ago, when he returned to Maozhou City from Chongqing, the people and livestock property of Weimao and Weimao had already moved to higher places. Since ancient times, the people of these two states have lived in the mountains and valleys where earthquakes and mudslides are frequent, and it is not uncommon for rivers to be blocked to form dammed lakes and burst embankments. When they heard that the Thunderbolts were going to blast the dammed lake, they couldn't help but think of the terrible legend that had been passed down from their ancestors for generations, so they moved their families to safety early.

Hearing the agreed three thick horns below, Huang Dagen knew that the blasting preparations were all ready, so he waved the pennant in his hand down, and the herald next to him suddenly blew the brass horn in his mouth, the tune was like Yue Fei's "Man Jianghong", which was to tell the Thunderbolt soldiers in the river valley below to explode immediately. A few minutes later, a deafening explosion rang out, followed by a huge cloud of smoke and dust, which gradually spread in all directions. Huang Dagen at the top of the mountain felt that the ground he was standing on was trembling slightly, and the roar of thousands of horses galloping could be heard in the river valley below, which was the sound of the flood violently crashing against the banks on both sides.

The monstrous flood caused by the burst of the levee rushed downstream with an extremely terrifying sound. Due to the narrowness of the river in Weimao and Weimao, the flood peaks formed were tens of meters high, and the trees on the lower banks were swept away everywhere they went. Fortunately, the houses built in the river valleys in the two states were all made of stone, and not many were washed away. On the one hand, the river channel of the plain is wide and the flow rate is gentle, and on the other hand, the rivers on the western Sichuan Plain are introduced by the Dujiangyan Water Conservancy Project. Everyone in the world knows that the role of Dujiangyan is to create a fertile West Sichuan Plain, thinking that its role is irrigation, but they do not know that they have forgotten its other flood control function. It is precisely because it locks the impermanent Minjiang River that the western Sichuan Plain has become "water and drought from people, not knowing hunger", so Li Bing and his son were worshiped by the people of western Sichuan.

However, the amount of water in the Widow's Cliff Dam Lake is so large that the flood caused by the breach of the embankment has only been weakened, and its flood peak is still far higher than the flood in a normal year. The surging flood water flowed down the Jinma River, not only flooding both sides of the river, but even flooding through the dense cobweb-like rivers on the plains, turning most of western Sichuan into a swamped country, and some low-lying areas were so deep that in some places the water was even several meters deep, and even small trees were submerged over the top. Although the terrain of the western Sichuan Plain is flat, there are also many high plateaus, and even low mountains and hills such as Wugen Mountain and Changqiu Mountain, and the property and personnel of the Perak Army have long been moved to these places, and they have made sufficient preparations, so the damage caused by the flood is not serious. On the contrary, due to the lack of rainfall and poor soil moisture some time ago, the flood just solved this problem, and also brought a large amount of nutrient-rich silt, which is extremely beneficial to the transplanting and growth of rice in the next step.

The damage caused by the floods in the areas occupied by the Mongol army was enormous. First of all, about one-fifth of the Mongols' summer grain has not yet been harvested. The Mongols regarded the Han Chinese as slaves, even if they were willing to be their lackeys as new annexes. Forced labor in the case of insufficient food and clothing, and being beaten and scolded, and harvesting food has nothing to do with themselves, where will the labor efficiency be high. What's even worse is that although there are also highlands and hills in the areas occupied by the Mongolian army, the flood is coming very quickly, and there is no time to move. Everywhere the flood peak passed, not only the houses and property on both sides of the river were swept away, and the countryside became a country, not to mention, even Chengdu City and the nearby cities of Wenjiang County and Pi County were also soaked in water, and the loss of personnel and property was extremely heavy, and even dozens of cavalry horses stationed in Chengdu were washed away.

Due to the low terrain of Pengshan City, and at the confluence of the Jinjiang River and the Jinma River, the wharf outside the city was washed away by the flood, and half of the water military camp was also washed away, and many warships also drifted downstream along the river, while most of the houses in the city were submerged in the water. Most of the Mongols in the city rode their horses to the low hills outside the city when the flood came. The Mongols, who had not had time to escape, had to huddle with the new annexed army on the walls that had not yet been submerged. Although they were lucky enough to escape, they fell into a situation where they had no food or drink. You can resist without food, but without water it is very unbearable. Under the sun, many people have to drink river water to quench their thirst. After drinking the unclean water, the effect was seen the next day—some people began to have diarrhea, so that the stench of the already crowded city walls was filled.

The further downstream the flood peak, the weaker the momentum becomes, and the smaller the damage caused. Only half of the city of Meizhou was flooded, and the material losses were even smaller, with the largest losses being naval vessels. This major flood came so fast that the Mongolian ships could not escape at all, and most of them were small boats, and half of them capsized under the waves. On the one hand, Yu Xing had already made preparations after receiving the warning from the Thunderbolt army, and on the other hand, when the flood peak reached Jiading, it had been greatly weakened, but it was larger than the usual flood, which only inundated a lot of land on both sides of the river, but did not affect the grain harvest. This is because Jiading Mansion is in the south of the western Sichuan Plain, and the summer grain harvest season is about ten days earlier, and the harvest has already been completed when the flood peak arrives.

The benefits of the flood not only weakened the Mongols, but more importantly made the river clearer. Previously, the Mongol army had set up a large number of water barriers in the river outside Pengshan City, making it impassable for the heavy gunboats of the Perak Army, restricting the use of the Thunderak Army's greatest advantageous weapon, and in fact blocking the water passage between the Perak Army and Jiading, as well as Xuzhou and Chongqing Prefecture. Le Quanan had reported to Ouyang Xuan before that it would take more than three months to clean up the river in Pengshan City.

The forces of nature are too strong. Now that the flood peak has passed, not only have the water barriers set up by the Mongolian army been swept away, but even many silted sandbanks have been washed away, increasing the width and depth of the river a lot. The Thunderbolts dredged the river on a large scale in the winter, spending a lot of manpower and material resources, and even using gunpowder to blast the sharp weapon, so that the waterway was barely accessible to warships in the winter. Wherever the monstrous waves went, its effect on river cleaning was far more than 100 times that of manual cleaning.

This man-made flood comes and goes as fast as it comes. After another two days, the flood waters had almost receded, and the people began to return to their homes from the heights. When the military and political council decided to blast the dammed lake, Ouyang Xuan asked the industrial company to accumulate a large amount of quicklime for disinfection after the flood. Although the flood was short-lived, it was necessary to strengthen hygiene and epidemic prevention because it was the season of high incidence of infectious diseases in the summer heat. Before the people returned home, Li Shuang had ordered people to distribute quicklime, and compiled a smooth mouth for people to recite and sing, mostly drinking water to boil, urine and urine to go to the toilet, eliminate flies, mice, cockroaches and other simple and easy content.