Since Zhao Bing established his own power, his only siege battle was to attack Guangzhou City. Although he had won the victory, it was incomparable to this attack. Ω Biqu                                                                                                                                                                                                                                         �

The experience of playing Guangzhou cannot be learned from, and there are only a few cards in hand. However, Zhao Bing cannot do it without playing with some tricks. He wondered how to play Suodu's grandson? Compared with the Yuan army, he had the advantage of the navy and advanced weapons; the Yuan army had the advantage of the cavalry's rapid power, powerful field capabilities, and the strong city defense of Quanzhou. These three things were enough for him to drink.

Zhao Bing calculated that the Yuan army's mobility relies on horses, and his mobility relies on boats. If his own boat really cannot run a horse, he will not have no chance of winning. He has never been to kindergarten and listened to the story of the tortoise and hare racing countless times. In a short period of time, the rabbits really ran fast, but the turtle is resilient, but slower but persistent.

According to the current marching degree of the army, it is generally limited to thirty miles a day. If you walk enough, you have to camp and rest. If you marching quickly, you won’t have to cross sixty miles a day, but you can’t last for a few days. You should know that in ancient times, war was entirely based on physical strength. Unlike modern times, you can fight as long as you have the strength to hook the trigger, so fighting half-tired is equivalent to dying. Of course, simple cavalry will be faster, but don’t believe in the nonsense of "traveling a thousand miles a day and walking 800 miles a day". Generally, it’s good to run a hundred miles a day. If you march continuously at this level, the dead horse will be left in a few days, so you have to take a walk and rest to maintain your mobility.

A large ship powered by the wind can walk twenty-five miles per hour in an average of the wind and fifteen miles against the wind, and at least two hundred miles a day and one night, so it is much faster than a horse. The boat does not need to stop and drink water, eat grass, and sleep like a horse. As long as there is water, you can sleep without rest. Therefore, on a long-distance raid, the boat will be a complete victory over the horse.

Zhao Bing calculated that Zhangzhou and Quanzhou were nearly 300 miles apart. The cavalry of Sodu would take three days to complete, and his fleet would be completed in just one day. If his entire army was feinted to attack Zhangzhou, Sodu would come to help at night and arrive smoothly after three days, but he would suddenly withdraw his troops to Quanzhou with a fright. In this way, he would arrive in Quanzhou in one day, but even if Sudu, who had just passed the long-distance marching, turned around and returned to the rescue, it would take five days to get four days of siege.

In this era, there are two main ways to open the breakthrough of the city wall by force. One is to use the siege ram under the cover of the mobile corridor; the other is to dig the underground tunnel all the way to the bottom of the city wall, then destroy the tunnel and cause the city wall to collapse. After the breakthrough is opened, then cross it to attack the city. Sometimes the siege troops also carry out siege assault without a breakthrough. They move towers or ladders, or lift hanging boxes, or use these methods to try every means to climb the barriers of the city wall. Sometimes, they secretly send an advance team to the city through the tunnel, then open the city gate, or attack the defending troops inside, thereby breaking the city.

However, it is not easy to use these two methods to break through Quanzhou City. It is often a protracted war of attrition and cannot be completed in a short period of time. If you want to use a strong attack to open a breakthrough, you need to compete repeatedly to achieve it. But it is not easy to open one, let alone three times. There is basically no need to think about digging tunnels in Quanzhou. There are many rivers, and the city is surrounded by trenches. If you can't dig them, water will come out. As a result, you won't be able to dig them until you can't say that you can't dig them, and you may have to drown them.

To sum up, Zhao Bing felt that even with the help of the crossbow, it was unlikely that it would take four days to complete all the things. Not only would it be possible to come back, but the reinforcements from other places would definitely be almost the same. He could not siege the city, but he was in danger of being surrounded by the enemy. Then he needed to arrange reinforcements, but the field battle was not the director of the Song army, which required a large amount of troops to consume, thereby weakening his siege, making things seem to have entered a dead end again...

"Defense is a more effective form of combat!" Zhao Bing thought for a long time, and suddenly a flash of inspiration came to mind a basic combat principle summarized by Clausewitz, which is usually used as a combat principle to save troops.

Therefore, Zhao Bing thought that since he could not break the city in a short time and could not afford to play the game of besieging the city and fighting aid for the time being, why not build a wall to block the enemy troops in the future, and then he could use the advantage of the Song army's defense. In four days, it would not be enough to attack the city, but building a line of defense should be enough. Field defense fortifications are like "multipliers". They do not use many people and have great effect.

Zhao Bing understood all this and began to recall the relevant battle examples he could think of. It was really good. It really reminded him of a person, but he was not a Chinese, but Caesar of ancient Rome. He was a typical ancient Roman general with strict thinking and outstanding organizational talents, and he created a complete set of systematic siege combat methods. Of course, in different siege combat operations, the siege machinery installation and manipulation and specific steps of combat are different, and it depends on the environmental conditions at that time and the combat actions of the defending troops.

However, one thing to follow is to establish a protective barrier belt around the siege position, so as to connect the isolated siege bunkers with a siege fortification, thus forming a complete encirclement of the defending troops. In addition, a barrier facing the outside of the city must be built to deal with the attack and attack of reinforcements of the defending troops. Caesar would build such a double defense wall without exception in every siege operation, use it to expand his front line position, and use it as a base for mobile field troops to implement combat maneuvers.
Chapter completed!