Despite the losses, the Luftwaffe did not give up the idea of an air bridge. The transport planes were now flying at low altitudes during the day, trying to break through to the surrounded troops by single planes or in small groups. I found it more difficult to counter this tactic because there were too many targets in the sky at once, especially considering the numerous Messerschmitts that were trying to be everywhere at once, to prevent Soviet fighters from hunting down Junkers and Heinkels.
With this arrangement, the air defense position areas were no longer needed, and I again distributed the anti-aircraft artillery more or less evenly throughout the western part of the encirclement ring. In fact, I did everything I could. The Germans lost almost three hundred transport planes in four days. The flow of cargo to the Moscow Pocket was cut in half and continued to decline. There was nothing more for me to do here, but the order that had been given to me had not yet been cancelled. I got ready to wait, but the adversary decided everything for me.
Having weighed the pros and cons one last time, Ewald von Kleist came to the conclusion that there was no point in dragging it out further. On reduced rations the Army Group Center was growing weaker and weaker every day in the Moscow Pocket, and all that the Führer could allocate to strengthen the First Panzer Group, Kleist had already received.
On December 21, five tank and three motorized divisions of the Wehrmacht took the offensive north of Vyazma. Before the attack, the Führer's address was circulated to the troops:
"Soldiers, 150 kilometers of frozen land lie before you, which the Russian armies are holding on to with the last of their strength, and beyond this land are your comrades, who are waiting for help and believe in your unbreakable fighting spirit! This time you have only one way to go ahead and win! The time has come to cast aside all the restrictions that our enemies tried to impose on us in pre-war times. We have weapons capable of overturning the Bolshevik hordes and reversing their movement, and we will use them here and now! You will celebrate Christmas together with the heroic soldiers of Army Group Center!"
I saw tanks, assault guns, armored personnel carriers, and artillery moving into forward positions at night. The Germans took into account the lessons of November and tried not to create areas with a high concentration of troops. There was nothing I could do about it the order of the Headquarters of the Supreme High Command bound me hand and foot, but in the evening of December 20 I still could not resist and called Shaposhnikov.
Comrade Marshal, the Germans will take the offensive tomorrow at dawn. The main blow will be struck on the Holm-Zhirkovski-Gzhatsk line. Auxiliary strikes will take place near Vyazma and Rzhev. Artillery preparation will be combined, using chemical and conventional shells. In the direction of the main attack the enemy will use only volatile gases that do not linger on the ground, so that they themselves do not suffer from their own toxic chemicals during the attack. It is most likely to be phosgene and cyanogen chloride, the latter being more likely, as it has a shorter period of latent action and old-style gas masks are ineffective against it. The Germans have few infantry, and will make extensive use of persistent poisonous substances to cover the flanks of the breakout various mixtures of mustard gas and lewisite.
There was silence on the phone for a few seconds.
Comrade Nagulin, is this intelligence data or your own analytical conclusions?
I could hear the tension in Shaposhnikov's voice.
Analytical conclusions, Comrade Marshal.
There was another pause in the conversation.
Are you absolutely sure you weren't wrong in your inferences? asked the chief of general staff, not trying to hide a heavy sigh.
Absolutely.
What about sarin?
There might be sarin, but it is unlikely to be in large quantities.
I heard you, Lieutenant Colonel. If your information is confirmed, be ready to leave for Moscow immediately. Wait for the order.
* * *
The outer front of the encirclement collapsed and crumbled like a house of cards. I was afraid of something like that, but I still wasn't expecting such a crushing effect. When von Kleist got his hands on the new weapon, he decided to use it to its full capacity in order to maximize the effect of surprise, although it was somewhat marred by the Abwehr's botched operation with sarin bombs.
Kleist was supplied with an abundance of chemical munitions, of all types, for every conceivable purpose, and an hour before dawn the Wehrmacht began its first massive use of chemical warfare agents in this war.
Heavy howitzers and aviation were the first to engage. Thousands of high-explosive shells and bombs, among which were many munitions filled with phosgene and cyanogen chloride, hit the front lines of the two infantry divisions of the Kalinin Front.
Combat gases quickly dispersed over the area, poisoning those Red Army soldiers who did not have time to put on gas masks. Of course, after the order of the Headquarters of the Supreme High Command and especially after the gas attack on the anti-aircraft gunners, the readiness of the Soviet troops for chemical warfare was increased, but the fighters, who had never used gas masks in combat before, did not have time to react to the danger in time. Many soldiers' gas masks were ill-fitted or faulty, or in some cases were simply missing.
The death of comrades from bullets and shrapnel was a familiar sight for the Red Army men during the past six months of the war, but death by poisoning was something completely different, previously unseen and terrible. By the time the German attack began, the morale of Soviet fighters was, to put it mildly, not at its best. In some places there was outright panic, and the German tanks, which had taken the offensive, broke through the first line of defense almost without resistance.
Only the Soviet troops in the central section of the breakthrough were attacked by flying gases, which practically never stayed on the ground and quickly dissipated even by a light wind. On the flanks the Germans used a completely different tactic. Mustard gas and lewisite in the form of special winter mixtures were used here to keep these poisonous liquids from freezing in the cold.
In addition to bombs and shells, German bombers made extensive use of airborne spray devices, creating wide swaths of contaminated terrain behind the flying planes. The dominance of Luftwaffe fighters in the air and the fact that the air defense assets were disorganized by the chemical attack did not allow the Soviet side to stop these actions, and zones of chemical contamination, impregnated with skin-explosive poisons, formed on the flanks of Kleist's tank group rushing forward.
To protect against mustard gas and lewisite, a gas mask is not at all sufficient. Their main target is the skin of enemy soldiers. The Red Army men who were attacked had anti-mustard gas capes in their kit, but their effectiveness in real combat conditions was extremely low, especially in the case of the combined use of chemical weapons and conventional ammunition.
Any meaningful resistance in the infected areas was out of the question. Surviving fighters were eager to leave as quickly as possible the area that had been chemically attacked, and they left their positions without orders. However, the Germans, too, were in no hurry to occupy the trenches left by the Red Army. Their goal was quite different to prevent Soviet counterstrikes under the base of the ledge, which was formed as a result of the breakthrough of the front and the development of the offensive by German tank divisions.