The navy's plan to go to sea was related to Qin's overseas strategic vision. But for now, Qin still does not have the conditions to go to sea. Qin's development of the south was seriously insufficient, and the land of Bashu was only a food logistics guarantee for Qin, coupled with poor road transportation. This will lead directly to the underdevelopment of the South.

If it wants to solve this problem, Qin must prioritize some domestic resource allocation in this direction. This is the only way to accelerate the amount of this resource allocation. But the Qin State does not have such a demand at the moment. Moreover, there was no resource that could arouse the interest of the Qin State's resource needs. In addition to timber and grain, there seems to be no great temptation in the south to attract the Qin State to allocate resources for this.

Moreover, for the first time, the core of this immature plan mentions a limited war. It seems that Zhang Han has noticed the benefits of Qin's products entering the Chu market, and if there is a full-scale war, Qin will have to mobilize a series of military resources to fight. This is what the Qin State does not want to see.

Although the role of war in promoting the development of commerce is already obvious. But this will undoubtedly increase government spending, and government spending will once again enter a period of unlimited borrowing. This is something that Shang Wen tries to avoid. Second, the war would increase the tax burden of the Qin state. Based on Qin's current war potential, there shouldn't be any problem in annexing a Chu state. But this will do no harm to the Qin state.

Qin's taxes would upset the current equilibrium, and at least Qin's taxes would increase to about five percent. This amount has exceeded the level accepted by Shang Wen's heart, and three percent is Shang Wen's psychological bottom line.

Not only that, but the economic era of Qin's prosperity and development will be hit hard, and the increase in taxes will reduce the level of investment, and at the same time, Qin will hit one of Qin's largest markets, the Chu market. This is bound to drag down Qin's economic slowdown. Qin will drag itself into the quagmire of economic crisis for the annexation of a country.

Moreover, how the state of Chu was annexed. How to develop, Qin is still not ready. Although the force has reached this level, the management level has not yet been reached. The war must be a limited war, preferably fought in a limited area on both sides of the Yangtze River. Moreover, only the waters of the Yangtze River.

Then, in the end, it will inevitably return to the diplomatic purpose, and the Qin State will use economic assistance, armed strikes, diplomacy and other means to achieve the goal of allowing the Chu State to open the golden waterway.

This was Shang Wen's strategic plan prepared in advance, and Shang Wen submitted this idea to the General Staff in the form of a memorandum. This was the first memorandum of the Qin State. This memorandum was the first time that the Qin State formally put forward the idea of controlling the golden waterway of the Yangtze River.

And just when the top brass of the Qin State was preparing to plan for the navy in advance. There was a major breakthrough in artillery technology in the Qin state.

The major breakthrough in artillery was the solution to the serious recoil problem of artillery. The Qin State successively solved the problem of artillery materials. The Qin State has cold-rolled steel and hot-rolled steel with high quality endurance. Cold-rolled steel is used for the lining of artillery shells, so that the high temperature and high pressure generated by artillery shells can be effectively controlled.

The gun body adopts the technology of wire winding gun body and barrel tight gun body. Plus a change in the charge of the artillery. A more powerful explosive charge was used, albeit with only a single-base charge, which allowed the gun to reach an astonishing range. Ten to twelve miles. This range surpassed all of Qin's long-range weapons.

But problems also come with it. Artillery is getting more and more powerful. The recoil is also increasing. Without a good recoil device, one of Qin's guns would retreat to a long distance behind after firing, and the accuracy and safety of the fire would also be greatly tested. It is precisely because of the recoil problem that Qin's standard artillery still uses a relatively backward six-inch gun, but the shells, medicine packs, and loading methods are improved, but if the recoil is not solved, the Qin State cannot have this kind of high-power artillery.

There is always a solution, the first steel gun mount is used on artillery, but this steel gun mount is used to defend fixed fortresses. If it is used for mobile combat, it is obviously not a good choice, because the steel gun mount is very cumbersome, and if it is pulled by a carriage, its speed is very slow, so to speak, the front-line war is over, and this artillery can't arrive. The Qin State only procured two gates for the defense of Hangu Pass, and the rest were never procured again. Because this artillery is just too bulky. If it weren't for the Hangu Pass by train, the military wouldn't know how to transport it to the Hangu Pass.

The problem will always be solved. The automobile industry in the Qin State began to develop, and both cars and trains needed good shock absorbers. Especially the crawler type, it is necessary to have a better shock absorber to solve the driving effect of the crawler vehicle.

Qin's hydraulic system has made great progress. Not only did laboratories begin to use large hydraulics to study various substances, but even steel mills began to use electromagnetic devices and large hydraulic systems to lift all kinds of steel. These hydraulics were first used in tracked vehicles. Since the hydraulics have such a large bearing capacity, then it is used for artillery. The withstanding capacity of artillery can also be compared with it.

So the first elastic artillery carriage of the Qin State came out. The principle is such that the gun body can be slid on the cradle by means of guide wheels, which are mounted on the gun carriage, which is connected to the piston rod in the reentry barrel. When the gun recoils, the piston compresses the hydraulic oil, causing a portion of the hydraulic oil to enter the air chamber through a narrow oil valve to compress the air. When the rear of the gun is seated at the end, it returns to its original position under the reaction of compressed air.

In this way, the problem of the gun carriage is well solved. The first artillery in the modern sense of the Qin State finally came out,

The advent of this cannon gave the Qin State a powerful new artillery, which was produced by the Wenyang Artillery Factory and finalized by the military as a 3.520 artillery. This is the artillery produced in the twentieth year of King Qin. The caliber of the artillery was probably a little more than eighty millimeters now. The artillery range was not calculated. The reason for this is that this artillery was soon used in the Western Regions War. Not even the gunner training. To this end, a whole bunch of technicians compiled a bunch of impractical instructions based on the characteristics of the artillery. They told the artillerymen in lengthy language what to pay attention to. Precautions when firing artillery. There are also possible dangers to artillery. Five copies of these manuals were issued for each gun. Because an artillery squad must have at least five people to operate the artillery.

But when this kind of book is sent. The artillerymen hated this book because it was an inch thick, and pages 1 to 20 were full of descriptions of artillery parts. From the first page, the artillerymen could not stand it.