Although the railway repair had not yet been completed, under the urging of Commander Xiao Liezhi, the 200,000 officers and men of the group army overcame all kinds of difficulties and actively carried out preparations for the general attack.

The first is to uproot the outposts and strongholds that protrude outside the enemy's main defensive line, and the group army will draw the elite of each army to form an assault group, concentrate on attacking only one stronghold at a time, and ambush mobile troops, ready to cut off reinforcements coming out of the city at any time. By the middle of March, all seven stronghold fortified outside the city were uprooted by our army, and more than 3,000 enemies were annihilated.

The second is to dig parallel trenches and communication trenches crisscrossed like spider webs close to the enemy's main defense line, and try to shorten the charging distance of the assault troops during the main attack, because the frozen ground is too hard, it has to use explosives to assist in excavation, so that the movement is very large, and it will be intercepted by Russian artillery or assault at any time, and our army can only cover the excavation troops' operations by means of artillery bombardment of the front line of the enemy's position without interruption, and at the same time selectively concentrate on destroying the multi-layer barbed wire array up to 50 meters wide in front of the defense line. The massive consumption of artillery shells once gave the logistics department of the Front a headache. By mid-4, the nearest parallel trench had been extended to less than 100 feet from the first line of trenches of the opposing side.

The third is to pre-build cement bases, roads, small railways, ammunition storage and transfer centers for heavy siege guns, and to build airfields and airship mooring yards for the army aviation units that will be stationed. By the end of April, under the super:.+, the above series of projects were basically completed.

In late March, the weather warmed up and improved, and the renovation of the railway line was progressing smoothly. The 1st Air Group, assigned to the Northern Theater of Operations, began to transfer to the newly built field air field on the front in batches. 4 The first batch of aircraft bombed the city of Ulan-Ude. 412, the first floating wing's old-fashioned "strong cloud" attack airship used for the first time a 2000 kilogram ground.|. = German Fortress - Of course, this kind of inaccurate bombardment is mainly used to shock and intimidate the enemy. By mid-April, the aviation squadron and the 12 floating squadron had all entered the theater of operations, with a total of 124 fighters, 57 reconnaissance and liaison aircraft, light bomber racks, 120 heavy bombers, and 6 transport aircraft. In addition to the permission of 24 airships, there will always be groups of Chinese military planes and boats of different sizes in the sky over Ulan-Ude, either reconnaissance, bombing and strafing, or dropping leaflets to persuade surrender, constantly weakening the morale of the Russian army.

On the 419th, the 3rd Squadron of the 1st Fighter Wing, stationed at the Slyudyanka Field Airfield, launched the first air battle in the Northern Theater with the incoming Russian planes, and the squadron leader, Lieutenant Mo Han, opened the record and shot down 3 enemy planes. All 14 enemy planes were shot down by the combat skills, and only 1 of them crashed when they landed. The Russian air force, which was at an absolute disadvantage, no longer had the courage to launch a "Slyudyanka-style" challenge, and the air supremacy of the Baikal side was firmly in the hands of the Chinese army.

In mid-April, the railroad that served as a supply choke point had been renovated, and the air force as a "combat power enhancer" had also been assembled, and the preparations for the general offensive had moved to the most advanced stage.

Within two weeks, more than 600 standard army trains drove directly from the mainland to the special unloading station of the group army outside Ulan-Ude, and transported dozens of siege heavy artillery pieces with calibers ranging from 210 meters to 460 meters, as well as various shells and bombs with a total weight of more than 100,000 tons. In addition, a large amount of explosives, oil, flamethrowers, submachine guns, grenades and other necessary equipment for fortification.

Among them, six 13-year-old 420-meter super-heavy howitzers were used on the battlefield for the first time

The reinforced concrete structure is designed to strengthen the fortress, the barrel is 7 meters long, and the technical performance of the 1,000-kilogram giant concrete destruction bomb is very similar to the Krupp "Big Bertha" 42 mm siege gun used by Germany to break through the Belgian fortress of Liège last year, but the imperial engineering department strongly denied that it had received technical support from the German side before the war, and the evidence is that the empire also developed a fourteen-year-old 460 mm super-large caliber siege mortar that Germany did not have - but in terms of caliber, Second only to the howitzers of the French army mounted on trains (shells weigh 1400 kg, range 16 km, and the total weight of the artillery cart is 290 tons), >: two.

The 14-year-old siege mortar has a barrel length of four meters and a total weight of 70 tons, and can fire C-pound blasting shells and concrete destruction shells with a range of 6,500 meters. Due to the short firing range of the gun, it is easy to be counterattacked by enemy fire, and it can also be installed on a special railgun car, using the railway mobile launch, this time transported to the Ulan-Ude front line of the 44 years of mortars only 2 equipped with special railgun cars, the other 2 can only be fired from a pedestal

The 83-year 380-meter siege mortar left over from the Aussio-Russian War was also transported here, this old-fashioned giant cannon weighs 69 tons, compared to the 14-year type, but can only fire 750 kg of ground shells, the range is 5700 meters, and the performance has been backward.

In the Asian-Russian War, a large number of one-year 305-meter heavy field howitzers were transported, 24 pieces of the gun were transported, the total weight of the gun was 36 tons, and the maximum firing range of 350 kg grenades was 8 miles.

The most striking thing is the four four-year 305-meter train cannons that occupy a full twelve standard military trains (four with guns and eight with shells ready to fire), this kind of long-range heavy artillery born during the Asian-Russian War was modified from the main gun of the Navy warship, with a maximum range of 22 kilometers when firing 450 kg grenades, and was originally intended to be used to bombard the Russian First Pacific Fleet warships in the port of Vladivostok at a long distance, but the only sample gun was beaten into slag by a salvo of self-propelled guns from 2039 in the "Task Force Incident" known only to the Future People Group... … In the strategic battle of the Almaty fortress before March, the appearance of this long-range heavy artillery, which relied on the rapid maneuvering of the railway and the use of the rapid construction of military iron to adjust the firing range, was fired safely outside the range of the enemy's fortress guns, which left a deep impression on the personnel concerned.

Finally, 30 mm grenadiers with no barrels and only a stick stabilizer on the base will try to be deployed in a line of parallel trenches close to the enemy fortress, this kind of close-in siege weapon with a fixed elevation angle has a total weight of 1,200 kilograms, a bullet weight of 500 kilograms, and a range of 1,000 meters, which is amazingly destructive and difficult to be detected and destroyed by the enemy.

At the beginning of May, the >+ artillery (excluding infantry guns and mortars under 120 meters) had already been redeployed, and the Fifth Air Group was well prepared and everything was ready, except for the east wind - a period of good weather suitable for large-scale shelling and bombing, and conducive to the use of special smoke grenades.