After successfully turning his sister Catalina on the 'road to becoming stronger', Shu Zifeng was very 'intimate' to create a killing martial art suitable for Catalina's practice, including a large number of melee combat moves, weapon knowledge, and assassins' skills to hide their whereabouts and escape from pursuit, etc., while the internal strength of the heart and Shu Zifeng practiced the Panlong and Phoenix exercises.

Shu Zifeng tried to improve Katarina's combat effectiveness, on the one hand, he wanted to turn this sister who relied on him into a 'useful killing tool', and on the other hand, the blood relatives of the same cultivator Panlong Fu Feng Heart Method could speed up the improvement of the martial arts realm through double cultivation secret techniques, especially for Shu Zifeng, who had already sensed the sense of qi, because this sense of qi came from the power of the blood sister's Yuan Yin, and his dual cultivation also had an effect on improving the sense of qi.

As long as he can improve the cultivation of his martial realm body, Shu Zifeng will not let go of any way, which is not only related to his survivability in the war, but also can improve Shu Zifeng's lifespan!

No one will resist the temptation to live longer, and immortality is a pursuit that humans will never give up.

Therefore, even if Shu Zifeng does not need to personally go into battle to kill the enemy in the future, he will tirelessly practice martial arts, relying on the point scroll of the conquest system to exchange life is too pit, it is not as good as the progress of the martial arts realm, every time he improves a martial arts realm, the life span is increased in ten years, Shu Zifeng naturally has to rack his brains to practice the Panlong Fu Feng Heart Method!

When Shu Zifeng improved his cultivation and prepared for battle, the aristocratic army of the Grand Duchy of Moscow from the direction of Vologda took the lead in attacking the northern territory subdued by the Grand Duke Yaroslav.

Because the army of the Grand Duchy of Moscow in the direction of Vologda City has a main force composed of tens of thousands of professional mercenaries, noble guards, aristocratic cavalry and other full-time professional soldiers, plus more than 20,000 conscripted peasant soldiers, urban armed militias, logistics miscellaneous and other miscellaneous troops, and the border defense troops arranged by the Grand Duke Yaroslav, they were destroyed by the Vologda army in one face.

Alibachi, who got the news from the rear, did not dare to engage this army of 10,000 elite and 20,000 auxiliary troops at all, and carried out the second set of countermeasures once ordered by Grand Duke Yaroslav - Fortified Clearing.

Grand Duke Yaroslav was well aware of the outcome he faced after the defeat, and after the war began, he naturally did everything he could, and the young men in the territory that were about to fall were forcibly relocated to the Acropolis fortifications with Yaroslav as the main body, serving as cannon fodder and coolies.

The old and weak, women and children remained in their original hometowns, leaving them to fend for themselves in the face of the oncoming Vologda army!

In order to reduce the war army expenditure as much as possible and improve the soldiers' fighting enthusiasm, both sides of the war in this era will allow the soldiers to loot the local area when they capture towns and villages, of course, it must be in the enemy-occupied area.

It is conceivable that this group of local civilians who have been squeezed once by Grand Duke Yaroslav will face what kind of predicament, those foreign soldiers who can't grab useful things will not have the slightest pity for this group of old and young women and children from other places, soldiers and civilians in this era have no national concept, only the difference between the country and their hometown, and the national concept is also quite weak, so the soldiers have no psychological pressure to do things to civilians in the countryside......

These big-headed soldiers, who are illiterate and uneducated, do not know what is called courtesy, righteousness, shame, and what is called the glory of human nature, they only know how to plunder and kill, and after the war, they can return to their hometown with a lot of wealth and glory, and show off in front of their neighbors and friends.

Because the behavior of Grand Duke Yaroslav was a rebellion, these soldiers had a legitimate basis for robbery, and the civilians had no human rights, and the nobles above their heads rebelled, so they naturally couldn't please them.

Grand Duke Yaroslav never expected to defeat the Vologda army, which was far outnumbered by his own troops, in a field battle, and his strategic plan was simple, relying on the defense system centered on the city of Yarogov, collecting all possible supplies such as grain and grass, and resisting the crusading army of the Grand Duchy of Moscow, waiting for reinforcements from the United Kingdom of Poland and Lithuania to arrive 'perhaps'......

As for Shu Zifeng's troops, in the eyes of Grand Duke Yaroslav, they were just a friendly army to share his pressure, and he never expected any miracle that Shu Zifeng, who numbered less than 10,000 people, would bring.

In order to defend his last lair, Grand Duke Yaroslav recklessly overdrafted the manpower and material resources of other towns and villages in other territories, and fortified four fortified acropolis on the periphery of Yaroslavl, as well as several small war strongholds.

There are more than 50,000 young and strong people and more than 10,000 soldiers who have undergone military training in the entire defense system, and when a fiefdom with real power is fighting for his life, the potential is still very huge.

However, the consequence of this was that within ten years, all of Yaroslavl's territories could not return to their pre-war prosperity, the fields were abandoned, the workshops were destroyed, the buildings were emptied, the old and young women and children were deprived of their family pillars and their only remaining food rations, and they were starved to death and bullied and killed in droves!

Of course, this is not a problem for Muscovy, when the Mongols conquered the west, the situation of the land invaded by the Mongols was even worse than this, as long as the land remained, it would not be long before a group of refugees who moved over after the war could be revived.

In the eyes of the upper class, land is the fundamental wealth, and the population is just a renewable resource, like leeks, a batch of them need to be cut down when there is a war, and they can grow soon in peacetime.

As long as the commoners are poor enough and not starved to death, the nobles will never be short of manpower if they want to recruit soldiers, and those knights who own land, in order to keep their status and fiefs, will also try their best to exercise their personal martial arts and enhance their strength, because in the nobility bill of Muscovy, knights' fiefs can be deprived!

The reason for the deprivation was the refusal to obey military duty, or the death of a man who did not inherit the knighthood to join the army to fight......

To put it bluntly, the knight class is nothing more than a lifelong hereditary senior thug bound by the nobles with land, and even those small nobles, in the eyes of the king and the big nobles, are also a kind of 'expendable' soldiers, unlike the big nobles who have been inherited for a long time, the small and medium-sized nobles are not permanently fixed, a war and a rebellion, I am afraid that a group of small and medium-sized nobles can be replaced by a stubble!

While the army of Vologda was eyeing the city of Yaroslavl, the army of Rostov also embarked on the journey, and this army was already regarded as a stepping stone to the upward movement by Shuzifeng!