Hu Weidong's order can be successfully completed, in addition to the wonderful use of the giant roller, the weather in Lunan is also indispensable, although the early winter here has been relatively cold, but the minimum temperature has not dropped below zero, otherwise the land will become very hard when frozen, it will be much more difficult to press, and now this is the best, the weather continues to turn cold after the airport is pressed, and soon the ground of the airport will be frozen hard, not to mention the Soviet-style aircraft, and even the Japanese planes of the North China Air Corps can also take off and land......

After the completion of these airports, Xuzhou not only entered the combat radius of the North China Air Corps and the Soviet Aid Air Force aircraft, but also the best distance, not to mention that the devil could not send planes to reinforce Xuzhou for a while, even if it could be withdrawn, it would be difficult to regain the dominance of Xuzhou's airspace. On this basis, we gave full play to the artillery superiority of the 15th Group Army, especially the mortars with a relatively short firing range, so that we could boldly shell to our heart's content (Note 1), giving great damage to the Japanese army, while completely suppressing the Japanese machine-gun fire, and thus greatly reducing the casualties of the infantry charge.

And the bomber Hu Weidong did not completely ignore it, and concentrated on using bombers to carry out air strikes on those enemy artillery positions and places where the resistance was particularly stubborn. It can often receive miraculous results, especially the cluster airburst aerial bombs (sub-artillery shells are airburst bombs) that have recently begun to become the focus of production in the classification of aerial bombs in the arsenal of the Central Plains Border Region......

However, as a secret weapon, the cloud burst bomb still worked wonders, although in this campaign, its lethality against the enemy was actually not as good as that of the air burst submunitions, and the production cost was higher (mainly because the production was still low, as the production capacity continued to increase). The cost of Cloudburst Bullets will eventually be reduced to about the same level as regular ammo. And because mass production has not officially begun, Hu Weidong has several thousand rounds available at hand, and they are all Shiyan-type shells, all of which are available in various calibers. However, compared with traditional munitions that rely on fragmentation, cloudburst shells have a unique advantage, although the effective killing radius at the same caliber is at least 30% worse (that is, only half of the fire coverage area......

For example, a conventional artillery shell with a so-called effective kill radius of 100 meters can only rely on its terrifying shock wave to kill all enemies within a radius of more than 10 meters from the center of the explosion. Outside of this range, however, they rely mainly, or even completely, on shrapnel to kill and injure the enemy, due to the fact that there are dead spots due to the explosion. Coupled with the role of fortifications, the actual effect is not as terrible as the numbers show. After the appearance of airburst shells and submunitions, the blind spots of shrapnel splashes were greatly reduced, but it was still impossible to kill all the enemies in the area covered by firepower, and as long as a few enemies survived and resolutely resisted on a position, it would greatly delay the advance of our troops, and even delay until reinforcements arrived and the previous efforts were wasted.

In contrast, the radius of damage of the cloudburst bomb is on the small side, but the unprotected infantry only needs to be within this radius of destruction. All of them will surely die, and nothing will save them. This has two important effects: first, in the battle of position, the use of cloudburst shells can ensure that the enemy's defense line is torn apart and the infantry can quickly follow up and occupy, so as to divide and encircle the enemy and annihilate it, which is much more effective than the flat push of the battle line; The second is a devastating blow to the psychology of the enemy's troops, even if the death rate is as high as 90%. Humanity may still be lucky, and with this psychological support, the enemy will be strong, but if they know that they will die, even the Japanese officers and soldiers who are recognized as the least afraid of death during World War II. The percentage that can withstand such heavy psychological pressure is not much higher. The latter is surprisingly good if combined with the terrifying scene when a large cloud burst bomb explodes, but in order to temporarily preserve the secret of the cloud burst bomb, Hu Weidong only dared to use it piecemeal, and did not produce a large cloud burst bomb, so this aspect did not achieve much results.

There is no way, the disclosure of the cloud burst bomb will certainly shock and frighten the great powers, if they cooperate to intervene out of the idea of "preventing trouble before it happens," it will be difficult to resist with China's current national strength, and even if it relies on the people's war to defeat the great powers with difficulty, it will inevitably be blocked by all countries, and this will undoubtedly cause a huge hindrance to China's rejuvenation. Perhaps China's initiative to transfer cloudburst bombs to the Great Powers could avoid this danger, but China finally has a killer weapon that can make the Great Powers fearful, and just surrender it to its future enemies, or at least competitors, who is willing? As the chief designer of the cloud burst bomb, Hu Weidong is naturally even more unwilling, so he can only keep it secret for the time being, as long as another year passes, the regular army of the Red Party will exceed 2 million, and the cloud burst bomb will also be equipped with a large number of troops, and the Japanese army will be further damaged, and the base area will be further expanded, even if the great powers still want to intervene at that time, China may not have the strength to fight a war, after all, judging from the example of the eleventh alliance interfering in the Soviet Russian revolution, the liliang that the great powers can invest in the expedition is still limited after all......

In less than 20 days, the 15th Army poured out more than 150,000 artillery shells (more than 90 percent of which were mortar shells) almost as if it didn't need money, and the total amount of gun grenades, rockets (barrels) and grenades exceeded 1 million. In the face of the unprecedented terrible firepower of the 15th Group Army, the devil could not resist the steel with flesh and blood, and the number of casualties continued to set a new record, by the end of November, the Japanese casualties had exceeded 200,000 people, and if the previous new 38th Division killed and wounded the Japanese army in three battles, the number of permanent attrition of the devil was no less than 250,000, and this number even exceeded the sum of all the previous 15 th Army's achievements. The effect of the powerful firepower was so terrifying that almost all the generals of the 15th Army and even the Red Party soon became staunch "artillerymen.........

Note 1: It is more difficult to transfer and conceal the barreled artillery, and the fire, sound and smoke emitted by the firing are relatively obvious, so in the case of losing air supremacy, it must be used very carefully, the barreled artillery is restricted, and the range of the grenadier and the infantry artillery is too close, and the devils have no good way to contain the fierce attack of the thousands of mortars of the 15th Group Army......

!