But this plan was ultimately aborted, because the KV-3 tank, with an improved turret, weighed more than 68 tons, which was too cumbersome (more than the "King Tiger" two years later). And the production of guns of the "ZIS-6" type is also very low, which simply cannot meet the needs of mass production of tanks. And with the entry into service of the "Stalin" series of tanks, the "KV-3" also lost its value of existence, while some of its styles were inherited by later Soviet heavy tanks.

"KV-220" was a test vehicle of the KV-3 and was part of the family program of the "KV" tank, only two prototypes were produced. The "KV-220" differed from the regular "KV" tank in appearance, it had a longer hull. Due to the overweight of the hull due to factors such as thickened armor, the engine of the original "KV" series tank was no longer competent, so in order to fit a more powerful engine, the hull was lengthened, a pair of load-bearing wheels were added, and the suspension was redesigned. The "KV-220" tank uses a 750-horsepower "V-5F" engine, and is intended to adopt a new turret with an 85-mm gun of the "F-30" type, which was specially designed for this tank by the 92nd Design Bureau under the direction of the famous Soviet artillery designer Grabin, which was previously successfully tested on the "T-28" medium tank. This gun can penetrate 500 mm of vertical armor at 120 meters, and the firepower is quite powerful. In addition, there are plans to install a 220-mm cannon or a specially made 95-mm cannon for the "T-28" for the "KV-107".

At the beginning of October 41, when the development of the "KV" tank in Leningrad had actually stopped, because of the lack of new tanks, the Soviet military decided to put some experimental tanks into use in the front-line troops, and before going to the battlefield, the tanks underwent the necessary repairs, during which "KV-220-1" and "KV-220-2" were installed with the turret of the ordinary "KV-1", and "KV-220-1" was assigned to the 124th Tank Brigade on October 5, 41, "KV-220-2" Assigned to the 124th Tank Brigade on October 16, 41. Both tanks were fitted with an F-32 76mm gun, which was later lost in battle.

At this time, hearing the news that they were going to be equipped with "KV-220" tanks, Sun Hui immediately moved his mind to modify it.

"What's a good idea?" Ye Chuchu asked.

"With it, at least we don't have to be afraid of the 'Tiger' tank." Sun Hui said with a smile.

"That's amazing, huh?" Wang Linlin's eyes widened in surprise.

"Of course, don't underestimate the skill of Soviet designers." Sun Hui replied with a smile.

At this time, none of the members of the "521" crew would have thought that in the future, they would drive this tank to compete with the famous "Tiger" tank.

After the defenders of Leningrad had made a bold counteroffensive and routed Major General Walter's left flank, Lieutenant General Lindemann, who had succeeded the fallen Major General Walter, had followed the advice of the new commander of Army Group "North", Colonel-General Quchler, and moved his headquarters to a specially built fortification by the engineering units closer to the battle line.

In the immediate vicinity of the headquarters, a marching radio station mounted on a gray-colored car was parked, which was also covered with a camouflage net. To their right are lined up cars and motorcycles of command officers.

The communications corps took the equipment to a hut on the top floor, where there were many cables and colourful wires through which Lindemann communicated with his divisions, corps, and Army Group North. Officers from the Special Forces Staff occupy a sizable room next door.

In the narrow doorway in the corner of the wall, there was a quercus marching table full of telephones. Sitting at the table was General Lindeman's new lieutenant, Will Brown. Lieutenant Colonel Herbert, he was a blue-eyed, yellow-haired, slender and thin man. The lieutenant colonel coped with the commanders of Lindeman's units and corps, and quickly coped with the ringing of the telephone.

The chief of staff of the army, Lieutenant General Cole, took a thick paper clip and quietly stepped on a shaggy carpet to meet the commander.

Lindemann sat him down at the table, invited him to smoke, and asked, "When will you complete the redeployment of the left flank of the troops?" ”

Cole lit a cigar and replied: "You are well aware, Mr. Commander: the Russians have inflicted heavy losses on our troops operating on the left flank. Their terrible 'KV' heavy tanks inflicted a lot of casualties on us, and how your predecessor, Mr. Walter, was killed, I think you know as well. Some of our units were actually destroyed, others were halved and a considerable amount of military equipment, especially heavy weapons, was lost. ”

As soon as he remembered the "KV-1" tank called "Crushing Fascist" that day, Cole's heart palpitated.

Lindemann frowned, took a deep puff of his cigarette, and said angrily, "I know all of this no worse than you. Now what I want is your answer to the question I just asked. ”

Cole coughed, looked at Lindeman, and then turned his gaze to the open notebook.

"Mr. Commander, it was only because of your foresight - the withdrawal of the troops of the left flank of our army to the pre-set line of defense - that our army was saved from the fate of rout."

Lindemann smiled with a happy look on his face.

Noticing the change in his mood, Cole continued: "Mr. Commander, by your order, the routed troops were withdrawn to the rear and regrouped. They were replaced by new troops from France under your command. Withdraw the heavily battered troops to echelon 2 to replenish personnel and re-equip. Their positions are handed over to the corps that serves as your reserve. In three days and nights, we will have all done this. ”

"That's fine, Cole, but what bothers me is that you're going to drain my reserves. And without reserves, no strategist can fight an offensive war. Fighting with the Russians is very dangerous without a reserve army. This is tantamount to sitting on a powder keg. These barbarians have literally thrown all the rules of warfare out of the sky. They fought day and night, rain and snow, and they fought to the last bullet, and not only the healthy people were fighting, but also the wounded, with bundles of grenades, shouting 'Ula' and rushing under the tank. They would rather die than be captured. Look at what is happening in our positions on the left flank. We successfully launched an attack on them, and they feigned a counterattack, but retreated to the east, leaving us a few settlements and railway stations, but by surprise during the night a powerful counter-offensive against our troops. Oh no, I can't and won't fight these bandits without a reserve, you know? Unwillingly! Moreover, at present, you and I belong to Army Group 'North', and what we are going to crush is the strongest walnut - St. Petersburg, the old capital of the Russians. Lindemann grew agitated and raised his voice.