Drawing lessons from the rise and fall of various dynasties in ancient and modern times, China and abroad, William's policy has always followed the principle of "strengthening the cadres and weakening the branches, controlling the internal and external phases, and controlling the heavy and the heavy", which is simply to strengthen the central government and weaken the localities.

Yu Wenbao of the Song Dynasty wrote the "Blowing Sword Record Outer Collection" once said: "Therefore, since the three dynasties, Qin, and Han dynasties, our dynasty has won the world with soldiers, and everyone has personally experienced the battle, learned martial arts, and knew the trend of heavy control and lightness." After a long period of peace, he forgot to write and forget martial arts.

Chen Zilong of the Ming Dynasty also said in his book "Yijing Bing": "Since ancient times, the emperor has established the country, and he has not wanted to live in the heavy and control the light, thinking that it is a long-term plan." ”

William deeply believes that most of the dynasties that have been handed down for hundreds of years or even thousands of years since ancient times have followed the rules of respect for the strong and the weak, and the light and the heavy, which is true in ancient and modern China and abroad.

And those powerful countries have a very short life span for the dynasties that govern them.

Take the Byzantine Empire, which is known as the "Defeat Court", for example, because the local power is too strong, and the local aristocracy and church power are deep-rooted, the Byzantine emperors with weak central power have basically not passed on to two generations.

The succession to the throne of the Byzantine Empire was even more chaotic, because the central power of the emperor was very weak, and the throne was either passed from brother to brother, brother to sister, or passed to son-in-law, adopted son, nephew, uncle, etc., and there were very few emperors who could formulate an heir to the throne according to their own wishes, and there were only a handful of emperors who could pass it on to their eldest son.

Having learned these lessons, William followed the concept of "strong cadres and weak branches, internal and external control, and heavy control" from the beginning of formulating the military and administrative systems of the Norman Kingdom.

As far as the military system of the Norman kingdom is concerned, the army of the kingdom can be roughly divided into two parts: the army directly under the king and the army of the noble vassals.

Due to the strong royal power of the Norman kingdom and the relatively weak power of the noble vassals, the army directly under the king has always far exceeded the army of the noble vassals in terms of the number of troops and the degree of elite.

This policy implemented by William is undoubtedly in line with the concept of strong cadres and weak branches.

In the army directly under the king of the Norman kingdom, it can be divided into three categories: the guard, the standing army and the civilian army stationed in various places.

In every war, the standing legion will recruit the militia soldiers within the scope of the military district to supplement the lack of personnel, and at the same time, it will also carry several militia corps with the army as a heavy logistics force and a force for maintaining public order and stability.

In peacetime, the standing corps that are not in the same or half formation as they have the right to conscript the militia within the limits of their respective military districts, and they can only be responsible for the defense within the defense area, relying on William's military orders to dispatch the militia to assist in the defense.

Generally speaking, two of the five standing legions were sent each year to defend the capital along with the Guards, while the remaining three legions were sent by William to England, Lorraine, and France to take charge of the defense of each of the three places.

In this way, William made two halves of the whole army, half of the Beijing division, and half of the garrison in various places, so as to balance the distribution of troops in the capital Paris and the garrison and the garrison in other places at once, so that the garrison of the capital would be sufficient to stop the possible rebellion in the field, and the garrison in the field would also be able to stop the internal changes that might occur in the garrison of the capital.

William's move is in line with the governing concept of "internal and external control".

After "strong cadres and weak branches, internal and external control", William made another preparation, that is, to use the full elite guard corps to suppress these five standing corps that were not satisfied with the formation, which completely followed the concept of "heavy and light".

Using the elite and full guard corps to suppress the five standing legions in the country, using the army stationed in the capital to suppress the army stationed in other places, and using the army directly under William to suppress the army of the noble vassals, so that William can completely control the military power of the entire Norman kingdom, which can not only play a role in protecting the capital, but also control the army more effectively, so that the imperial power is more stable, without worrying about any disobedience and ill-intentioned people.

William was quite complacent about formulating such a perfect military policy, and he firmly believed that as long as his heirs could adhere to this military policy and firmly grasp the army, the rule of the Normandy dynasty would continue for hundreds or even thousands of years.

However, the military policy formulated in accordance with the criterion of "strong cadres and weak branches, internal and external control, and heavy control" is not without its flaws, and its biggest flaw lies in its lack of strength and enthusiasm for external expansion.

Because the national policy of "strong cadres and weak branches, heavy and light" is to shift the military power of the Norman kingdom from external expansion to internal suppression, and transform the offensive military policy into defense, if there is no strong emperor with a strong desire for expansion to power, the military strength of the whole country will be changed from defense to offense, and the Norman kingdom is likely to hold on to the territory it originally owned for hundreds of years.

However, this slight flaw is indeed insignificant to William, who, as the founder of the Norman dynasty and a powerful emperor with a strong desire for expansion, is fully capable of transforming the military power of the Norman kingdom from defense to offense.

This can be seen from the fact that William sent most of his army out to expand his territory, while the capital Paris was defended only by the Guards.

The Guards Legion, as William's most relied on direct legion, is absolutely the best in the world, and regardless of the sophistication of the equipment and the number of equipment of this army, judging from the soldiers of this Guards Legion, its soldiers do not include Norman warriors selected from the nobles and knightly families throughout the country, but also the best soldiers and generals of each legion.

Every three years, William would select 5,000 of the best soldiers from the five standing regiments to join the Guards Legion, while the 5,000 soldiers who were replaced were sent down to serve as officers and backbones in the standing and civilian regiments.

By transferring the best soldiers and generals of their respective legions into the Guards, and sending the soldiers of the Guards to the various legions and civilian legions, William had a little more control over the five standing legions under his command.

In the future, William's five new corps will also be implemented with reference to this method, among which the firearms corps will be organized by William into the Second Guards Corps, as the mainstay of suppressing the domestic army.