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The reason why such a great deal of effort was actually because the Japanese military department was well aware of the terrible situation of the 15 th Red Army and wanted to continue to maintain the Japanese army's psychological superiority that "one brigade can defeat one Chinese division." In addition, trying to control the scale of the war to avoid a full-scale war with China too soon is also an important motivation. Otherwise, it would be much more convenient to directly mobilize superior forces to strangle the Red 15 th Army than the current practice. However, the Japanese army dispatched two divisions and one brigade at the same time, but did not set up a corps-level establishment for unified command, and it was also out of the same consideration

Originally, the devil planned to use the 12th Division to attack as the main force (why not equip so much heavy firepower) with the assistance of the 4th Division, and then use the highly mobile fully mechanized troops, the 1st Brigade and Regiment, to pursue and cover the kill, so as to completely annihilate the Red Army at the minimum cost. On the open and flat Great Plain of North China, no matter how powerful the Red Army's iron feet were, they would never be able to outrun the wheels of cars and the tracks of tanks

However, the Red 15th Army immediately returned south after destroying the Chengde Airport, which was obviously unexpected by the Japanese military department, and even Ishihara Waner, a rare strategist among the Japanese army, did not expect the Red Army to move so resolutely and quickly, and then the Japanese army's Jihua was completely disrupted. In order to prevent the Red 15th Army from escaping, the Japanese military headquarters had to temporarily change the operation, on the one hand, brazenly sent troops to forcibly seize the Shanhaiguan Pass so that the Kwantung Army could enter the customs as soon as possible (this move would naturally stimulate the 29th Army, but Song Zheyuan, in order to preserve his strength, strictly ordered Zhang Zizhong and other subordinates not to attack without authorization, unless the Japanese army attacked Pingjin, and the Japanese army, which understood Song Zheyuan's bottom line, was now a great enemy, and would not give Zhang Zizhong a chance to make a move), on the other hand, let the most mobile independent mixed into the 1st Brigade go first, Catch up with the Red Army as fast as possible, if the Red Army chooses not to entangle with them, it will inevitably suffer heavy losses under the pursuit of mechanized troops, then even if the Japanese army cannot completely annihilate the enemy, it can at least win a big victory to save face, and if the Red Army chooses to counterattack, then the independent mixed 1st Brigade only needs to hold out for a few days, and when the two permanent divisions arrive, they can crush the Red Army in one fell swoop and win a greater victory.

Out of fear of the attack of the 15th Red Army, and just in case, the Japanese military headquarters also temporarily transferred the tank wing (Note 1) of the 12th Division and the automobile fleet of the Kwantung Army (a total of more than 1,500 people, 6,700 vehicles). All of them were assigned to the 1st Independent Mixed Brigade, and one of its original field artillery brigades was strengthened into a wing, making the 1st Independent Mixed Brigade a powerful mechanized unit with a total strength of nearly 10,000 men and firepower even superior to that of some permanent divisions, and inadvertently giving the Independent Mixed 1st Brigade the ability to carry out armored cluster assaults

In the plains, the speed advantage of the mechanized troops was brought into full play, and in less than a week from the departure from Gongzhuling, the 1st Brigade of the Independent Mixed Brigade caught up with the main force of the 15th Red Army, which had just left Fengtai for the second time just a day earlier. Because they came too quickly, although the comrades who were lurking in Tianjin and insisted on working had already alerted the headquarters of the Red Eighth Army Corps in time, the Red 15th Army was still caught off guard by the devils. It must be noted that Hu Weidong did not relax his vigilance, but he never expected that the devil would send so many tanks at once (the 1st Brigade of the Independent Mixed Brigade in 36 was originally equipped with a tank wing, and the Japanese military headquarters filled these two tank wings with the highest standards, with a total of 240 tanks. The warning distance of 20 miles is enough to guard against the infantry, even the cavalry and the motorized infantry, because the cavalry itself is fragile and lacks firepower, and the motorized infantry has to get off the car after all, and the distance of 20 miles is enough for the Red Fifteenth Army to make a proper response, while the tank cluster is completely different, the advance and the battle can be completed at the same time, and the distance of 20 miles only takes half an hour...,

Due to the lack of time to build field fortifications, the 29th Regiment of the Independent Division of the Red 15th Army, which was responsible for the rear of the palace, was attacked by enemy tanks and rear artillery at the beginning and suffered heavy losses, a total of 54 guns and grenades equipped with them lost one-third before the enemy tanks entered the effective firing range, and the 6 battle defense guns that did not have time to build a sheltered position were all destroyed early because the devils understood the threat from the beginning, although the remaining grenade shooters of the 29th Regiment after the devil tanks approached successfully destroyed 3 tanks, But it also attracted the attention of the devil and was attacked by concentrated fire, and soon all of them were killed.

Without anti-tank weapons, the 29th Regiment, which concentrated its forces on the frontal blockade of the Devil Tank Group, was under great pressure, and for the relatively thick main armor of the Devil Tank, the rifle machine gun was helpless even if it used steel core bullets, and the commanders and fighters of the 29th Regiment had to pull the blasting canister and rush towards the Devil Tank, although they successfully blew up 2 vehicles, they still failed to block the enemy after all. It only took about 10 minutes for the more than 200 tanks of the devil to completely break through the defense line temporarily established by the 29th Regiment, and if it weren't for the thousands of mechanized (motorized) infantry who followed up behind and did not get out of the car to make up for fear of being left behind by the tank group, the 29th Regiment, the main force that could rank in the top ten even in the entire Red Eighth Army Corps, would have been wiped out

At this time, Hu Weidong felt helpless for the first time, he paced back and forth with a blue face, but he never thought that he could immediately block the hundreds of devils (the commanders and fighters of the 29th Regiment had no time to count, and the battle situation was too tragic, so it was natural to overestimate the number of enemy troops. Tank approach.

In fact, as early as when the army was raised in the south of the Yangtze River, Hu Weidong took into account the threat of Japanese tanks and armored vehicles during the Anti-Japanese War, and developed a hollow charge shaped energy armor-piercing gun grenade early, which has now been equipped to the platoon level, and various anti-tank tactics are one of the compulsory courses for grassroots commanders, but because the Japanese army has never used tanks and armored vehicles in history, Hu Weidong is mainly aimed at the Japanese army's infantry and tank coordination tactics of covering infantry attacks with tanks and armored vehicles, although he has also talked about armored group assault tactics, But it was used to guide the attack of the armored brigade, and as for the tactics of defending against the assault of the armored group, Hu Weidong did not talk about it at all. And even if he said it, it was useless, although the Red 15th Army was not weak now, it did not have the hardware conditions to resist the assault of armored clusters

Note 1: In addition, the 12th Division also has a dedicated flying wing, but it is not needed for this campaign because there is no suitable airfield. It is said that the weapons and equipment of the 12th Division in 36 and 37 years are indeed unparalleled among the 17 permanent divisions of the Japanese army (but after 38 years, heavy equipment was transferred in large quantities, and its strength has plummeted since then.) However, in history, the division was responsible for garrisoning Manchuria in the early stage, and was transferred to Taiwan to defend it in the later period, and did not participate in any major battles, so its reputation was not obvious.