Of course, the action of the Crimean Khanate to dispatch troops and generals inevitably attracted the attention of Czar Russia. Czarist Russian generals stationed at the border, such as general Nikita otyevsky, Prince Yuri boriaginsky, leader naum Vasiliev and general Vasili butullin, sent letters to Moscow one after another, informing Moscow that the Crimean Khanate was likely to send troops and loot in the near future and requesting Moscow to send reinforcements for support.


    In fact, for nearly 200 years, Czarist Russia had already found a way to resist the invasion of Crimean Tatars. In order to fight these enemies who came and went like the wind, the Russians built strong fortifications in many cities along the border, and each city was equipped with dozens of guns.


    When fighting in the field, the Tsarist Russian army would combine hundreds or thousands of carts to build a huge vehicle base. These bases are similar to Christina''s and their chariots against ah Hun mi''er at Ackerman wharf. They are spliced with vehicle wooden walls. If the construction is successful, the soldiers of Czar Russia can build a square wooden base 2000 meters long and 1000 meters deep in a short time, and the maximum wooden base is even more than 10000 meters long. Not to mention Crimean Tatars without firearms, even poles and Swedes have a headache when they see such fortifications. The wooden base can be fired with fire guns and artillery when retreating, and can be pursued by cavalry when entering. It is a sharp weapon against Tatar light cavalry.


    Therefore, since the "spear of the orchid" was broken by Ivan IV at the beginning of the battle of molodi, although the Crimean Tatars still invade the southern frontier of Czar Russia every year, the income is getting lower and lower, but the cost is getting higher and higher. Under normal circumstances, there is no need for Moscow to provide reinforcements. As long as the cities in the southern frontier are strong and clear, the Tatars in Crimea will retreat on their own after plundering some rural areas.


    But this year is special. In 1655, czar Russia mobilized 60000 troops to invade the Republic of Poland. With the deepening of the war and the subsequent dispatch of troops to Riga, the important town of the kingdom of Sweden, czar Russia invested more than 100000 troops in Poland and Sweden. Nearly 20000 of these troops were drawn from the southern frontier. These troops were originally intended to defend against the invasion of Tatars. Czar Alexei Mikhailovich and his generals did not know that this would lead to the emptiness of troops in the south, but they had to drink poison to quench their thirst in order to cope with the war.


    Therefore, in the second half of 1656, there were only 2000 people left in the fort of isium, which had 4000 people stationed; In the important town of Kursk, there are only 3300 troops in total. Under the attack of tens of thousands of Tatar cavalry, these limited troops were not enough to defend even several big cities.


    All tactics are empty talk without anyone to implement them. Now, for the southern frontier of Czar Russia, what is missing is people.


    Moscow, which could not change people in a short time, could only order general Nikita otyevsky and others to keep the important town in the South and wait for Moscow to send troops back from the Polish front line.


    On March 21, ten thousand cavalry led by bayazid Khan, the forward of the army of the Crimean khanate, arrived at the front line of the isyum fortress defended by Nikita otyevsky. The forward cavalry is composed of the elite of the Khanate. Although they are sharp, they have no artillery. After being tenaciously resisted by the garrison of isyum fortress, bayazid Khan ordered to stop the frontal attack and plunder the small town of lyubojin, leaving nothing but water and soil.


    After that, more than ten thousand Tatar cavalry, under the guidance of nogai cavalry, turned all manors and granges around isyum Fortress into a sea of fire. The defenders can only watch helplessly because of the lack of troops.


    On the 28th, Muhammad gley led the army to the isyum fortress. The smoke rolled up by 50000 Tatar cavalry blocks out the sun, and the green flag is like a forest that can''t go to the edge.


    Seeing such a great disparity between the forces of the enemy and ours, Nikita otyevsky resolutely gave up the isyum fortress. On the night of Muhammad gley''s arrival, he led the defenders in the city to break through and retreat to Kursk. In order to delay the pursuit of the Tatar cavalry, Nikita otyevsky ordered the soldiers to open all four gates of the fortress and lure the Tatar cavalry into the city for looting. But even so, the two thousand defenders still lost more than half.


    The failure of isyum fortress opened the gate of the southern defense line of Czar Russia, and Muhammad gley''s front pointed directly at Kursk. The connection between cherkesk and Kursk has also been separated and turned into an isolated city.


    While Muhammad gley and bayazid were making great strides, the 3000 troops led by Chechen were moving slowly along the coastline.


    It wasn''t Cherchen''s deliberate procrastination, but the soldiers of the free slave Corps slowed down.


    Because when the Russians in the free slave Corps learned that they were going to attack cherkesk, they began to lose heart. Although they didn''t say it, Chechen knew that they were very reluctant to participate in the battle. Because for them, attacking cherkesk is attacking their motherland and shooting their little father (czar).


    This depressed mood is not only the free slaves of Czar Russia, but also yelisi. On the way, he had to talk to Chechen several times, but every time the words came to his mouth, he swallowed them back. But from his hesitation, Chechen knew that yelishei was also unwilling to fight with people in his own country, especially with Tatars.


    Yelishei''s inner entanglement is because he can''t let go of his love for Cherchen and his motherland.


    Chechen was not Russian. He could not understand that in the era of great turmoil, when the Czar Russians faced the imminent threat of national destruction, they broke out the national cohesion belonging to "Moscow dimension" (Russia''s national identity image in the chaotic era) under the call of national heroes such as minin and zapolsky, That all czar Russians have a sense of identity and responsibility for their motherland. This is why in Smolensk, the Czar Russian militia, regarded as "gray animals", can endure abuse, hunger and cold, and fight recklessly in the rain of bullets. Because they believe that they are not fighting for the nobles, but for Russia.


    In this mood, only the slaves'' gratitude for Chechen''s Liberation and Stephan Racine''s iron and blood control maintained the whole free slave Corps. But an accidental incident made the situation of this already fragile army worse.