In order to prevent Cai Li from circulating the river and canals, the court came up with a plan to seal the river with iron ropes, but this was of no use to Cai Li, especially using iron ropes to block the Yangtze River.

Anyone who sails at sea knows that the reefs under the sea are the most dangerous. Usually, there are death ships that specialize in wading thunders in front of the fleet. These ships will detect hidden dangers under the water. Whether the iron cables are exposed or hidden under the water, they are easily discovered by the thunderstorm boats ahead. Once discovered, long-range strike artillery cannons can easily defeat the guards on the shore and easily land on the shore to destroy the blocked iron cables.

Cai Yan had heard of the iron cable bridge, but had never heard of anyone foolishly trying to block the broad river water with iron cables. He knew very well that the imperial court could only defeat or repel the giant ships in the South China Sea by using fire attacks, and used countless small boats to set fire along the river to block the invasion of the giant ships. However, Cai Yan also had countless ships of large and small under his name. How could pirates who were also accustomed to setting fires not know how to deal with it?

No matter how Li Gang planned, Cai Hua did not believe that he could stop the Nanyang Navy, at least in the short term, but the canal was different. The water surface of the canal was narrow and shallow. Some river sections even require a boater to drag even if they were loaded with grain, not to mention heavy sea ships with more than 5,000 materials. Even if they did not use iron cables, they could easily block the river channel by sinking some mud and sand ships.

The artillery used by the first and second divisions are light-weight mother-child cannons that are convenient for field combat. The Song people were extremely smart and very good at learning. When Cai Yan learned about the Manichaeism and the imperial court used gunpowder, he knew that Kaifeng would definitely imitate palm thunder, explosive pack, cannon, palm thunder, and explosive packs in private. The only difference is the difference in power and lethality. He believed that Kaifeng's top craftsmen had the ability to imitate palm thunder and explosive packs, but the cannons were different.

Casting cannons is not a simple matter. Only toughness and strong cannon bronze is a threshold. There is also the mud pattern used for casting. It takes several months or even a year to create a qualified mud pattern.

There are also a series of technical problems, repeated experiments, and repeated failures. Without several years, Kaifeng could not imagine making artillery. Even if it was made, Cai Huang believed that his artillery had a longer range and stronger power.

Cai Huang is very sure that Kaifeng will not be able to get artillery in the short term, but this does not mean that Kaifeng does not have long-range strike weapons. The most excellent ones are the Baniu Crossbow and the catapult car.

The first and second divisions have scorpion crossbows suitable for field battles to project thunder in the palm of the palm. Kaifeng cannot see this method of projecting ammunition. Without artillery, using the Eight-Nuo Crossbow and the Catalyzing Cart instead of the artillery became the best solution, and this was proven when sending letters in the north.

Cai Yan did not regard the State of Song as an enemy since the beginning. He used field cannons to make up for the insufficient firing rate of the convex gun and the convenience of marching, rather than for long-range bombing. In this way, field cannons are not as good as Baniu Crossbow, and the catapult has a longer range, so he can only transfer some heavy cannons.

Maritime combat is different from land combat. Each sea ship is like a city fortress, which is a fierce battle between city fortresses. The heavy artillery used is often stronger than the field battle on land. The artillery used in city defense warfare is more powerful. Such heavy artillery is difficult to use in field battles. Just dragging heavy artillery carriages is a difficult problem.

The field mother and son cannons used by the First Division and the Second Division are three or five hundred kilograms of cannons, which use two-wheeled cannons during wartime. The marching is a cannon stand that can form a four-wheeled carriage. There is no problem with cattle and horses dragging three or five hundred kilograms of cannons, but it is much more difficult to drag thousands of kilograms of cannons, and the cannon carriage used must be redesigned.

The carriages of this era did not have inflatable rubber straps. Wheels that were only two fingers wide could easily fall into soft mud and could not move. They could only increase the width of the wheels to drag heavy artillery to walk. They could only use wheels as wide as tanks.

Cai Yan once watched a movie in his previous life. The name of the movie was not remembered. The background was during World War I, which tells the story of a war horse. He forgot most of the plot, but he remembered it particularly clearly when the war horse was captured and dragged heavy artillery. The wheel used was almost another type of tank track. It was a movable wood chip on the wheel, which was like a fish scale armor to increase the area of ​​the wheel.

The Buren armor in the Song Dynasty was a twig armor wrapped in iron sheets all over the body. The armor plate on the arm was the same as the fish scale armor plate. It was a movable armor plate. However, the fish scale armor plate was moved downward due to gravity, while the Buren armor plate was moved upward, which was convenient for soldiers to raise their knives to chop. The Song people had this mature technique. When Cai Yan came to the craftsmen and roughly told them about their ideas, they all knew what to do.

The wheels that are only two fingers wide have added an outer wheel. Upward movable wood chips are installed on the two two fingers wide wheels. It looks quite strange when dragging and walking, and it looks like a walking track is installed.

When the first weird carriage appeared in front of everyone, although it looked a little ugly and walked slowly, dragging a three thousand pound heavy cannon without any obstacles. Cai Huang was also very satisfied with this.

Cai Yan did not expect that it took two months for two hundred strange artillery vehicles. Yang Jian repeatedly suppressed his anger and repeatedly urged him. Until the two hundred strange artillery vehicles were completed, he did not hurry or slow down with 15,000 soldiers and horses to head north on nearly a thousand large and small ships.

There were crowds of people when I saw off in Hangzhou, and it was a different situation when I was in Suzhou. Apart from countless people watching the fun, there were almost not many merchants and gentry. All the way north, fewer and fewer people were greeting and seeing off. After passing Zhenjiang and entering Yangzhou, no one left the city to welcome him...

Nearly a thousand ships headed north along the canal. Zhao Ji, who had been angry for a year, gradually calmed down. Kaifeng City finally breathed a sigh of relief. The bastard finally stretched out his shrinking head.

The snowflakes are long, and only the snow should be left in the world. Kaifeng City is as lively as the New Year Festival. Festive red lanterns are hung in front of almost every household. Big red flowers are inserted into the head, and the young man gently shakes the folding fan. The beautiful woman covers her sleeves and chucks. The father is carrying young children. The old man pushes a wooden cart and shouts along the street...

A wooden sedan chair carried by eight people fell to the ground, and the thick blue silk was lifted up. The old servant bent forward and helped Cai Jing out of the sedan chair, looked down at the bright red cloth carpet under his feet, and looked back at the few men with swords hanging from the waist not far away. He shook his head inexplicably. He didn't know whether it was to sigh at Fan Lou's luxury or to the guard and surveillance of the Imperial City Spy behind him.

Qiao Niang saw Cai Jing's sedan chair from afar. Seeing the sedan chair carried by eight people falling to the ground, she accused the teasing young man in white and quickly came up to him. While supporting the old man, she smiled and said, "The old lady hasn't come to Fanlou for some days. Has the little Yanei made you angry again?"

Cai Jing knew that the "Little Yanei" who was teasing for women was the youngest son, so he couldn't help but think about the "Little Yanei" who came from the north.

"well……"

Cai Jing sighed lightly, looked at the old lady with red eyes, soft breasts and green clothes, and sighed bitterly.

"No matter how he makes a fool of himself, he is just a few birds, fish and insects, but Xiao Wu really took my life..."

Qiao Niang was stunned. Thinking of the rumors she had heard over the past year, she didn't know how to make jokes or persuade her for a while.
Chapter completed!