In the next two hours, the main attack section in the north proceeded smoothly, and the first echelon of each division quickly cleared the remaining mines, barbed wire, deer, and other obstacles on the offensive route, crossed the front trenches, which were mostly blown up and flattened, and were scattered with large pieces of shrapnel and stumps, and cautiously approached the fortresses and batteries surrounded by huge moats that were three or four meters deep and ten meters wide.

However, when the commandos of the first echelon tried to rush to the surface of the fortress and the fort through the collapsed part of the moat, most of them were subjected to a hail of shells of various calibers, suffering heavy casualties, and the dense artillery fire also broke the telephone lines through which many commandos used to communicate with the artillery, and the commandos who were cut off by the barrage were pressed in place, unable to advance or retreat, and could not play the leading role of the attack echelon.

In the case that the "Eye" and "Scavenger" were ineffective, the second and third attack waves, which were the backbone of the echelon, launched a continuous infantry company assault under the cover of the fourth wave of light fire support team, and were also intercepted by intensive curved fire, and after paying a huge price, they barely captured part of the surface position, but they were hit by the rain of bullets fired from the guns hidden everywhere. It was later found out that in the battle that day, the Russian army's French-made semi-automatic mortars equipped in armored turrets played an important role.

After nightfall, the second echelon of the first-line regiments of each division supplemented the first echelon, delivered ammunition and evacuated the wounded overnight, and connected the telephone lines connecting the artillery.

On the first day of fighting, the Chinese captured 4,000 wounded or gassed Russian soldiers, and a total of 6 forts and 7 batteries to the north and east of Ulan-Ude were partially cut off, but their fire still firmly controlled the passage into the city.

That night, after summing up the day's operations. Xiao Lieri decided to concentrate his efforts on the next day, uprooting the isolated strongholds one by one.

The first to be uprooted was Fortress No. 6, which was at the left end of the battle line, next to the Selenga River. In order to strengthen the close mortar fire of the attacking troops there, Xiao Lieri also transported 20 of the 30 heavy grenadiers directly under the group army to a dangerous area less than 500 meters away from the core position of the fortress overnight, intending to open the way for the assault troops with the help of a close-range salvo of 300 pounds of concrete destruction bombs.

After dawn the next day, the siege heavy artillery group followed the instructions of the forward telephone. Constantly correcting the hit points and accurately "knocking" the various fire points that had been exposed in yesterday's battle, the heavy artillery bombardment of a full 3 hours broke more cement and penetrated or overturned more turrets, and on this day, the Russian batteries were no longer able to return fire on the Chinese artillery.

At 10 a.m., on the side of Fortress No. 6, the last few rounds of mortars and heavy grenades sounded the horn of the infantry assault, and under the cover of grenade smoke, the attacking group carrying flamethrowers and blasting canisters crawled forward. A flamethrower is used to pour flames into the remaining holes, and then the Demoman inserts the blaster into the blaster. In the end, the assault team wearing smoke masks, carrying submachine guns, flamethrowers, and special smoke grenades carried the surface of the fort to the surface of the fortress and penetrated deep into the interior, attacking with fire and poison, and completely annihilating the remnants of the enemy.

In only 3 hours, the attacking force claimed to have captured the entire fortress, captured 200 enemies, captured a large amount of ammunition and food, and suffered fewer casualties

At the same time, as an auxiliary attack. Two regiments of the 22nd Division cautiously attacked the nearby 5th battery, but succeeded successfully, the ventilation system of the battery was damaged and failed in the heavy artillery bombardment in the morning, and the special smoke attack launched by the defenders before the attack of the 22nd Division remained. Almost without resistance, the Chinese assault troops were allowed to penetrate the inside of the battery.

Xiao Lieri, who tasted the sweetness, drew a gourd in the same way, continuously adjusted his deployment, and swept away the strong strongholds of the Russian army one by one from the left to the right of the battle line. On the 59th, Fort No. 5 and Fort No. 4 were taken, and Fort No. 4 and Fort No. 3 were occupied, and the passage into the city from the north was opened. On 511, the advance detachment with more than 1 armored car as the lead and the 177th Regiment of the 45th Division as the backbone broke into the Ulan-Ude railway station, and the Russian army in the urban area was divided into two pieces, so the general trend has been decided.

At noon in 512, Lieutenant General Mehliur, the commander of the garrison who was huddled in the 8 fortresses on the banks of the Ouda River in the south, sent an envoy to the railway station under a white flag to negotiate surrender. At four o'clock in the afternoon, the commanders of the two sides held a meeting outside the station hall that had become a ruin, and Mihrul asked for permission to allow "the officers to keep their sabers and the troops to retain their flags to surrender with dignity." Xiao Lieri said: "This commander deeply admires the bravery and tenacity of your army, so for the sake of understanding, the former is okay, but the latter is not allowed." If your commander wishes, he can set an example for all the officials and take the lead in participating in the multi-ethnic integration of the Buryat Autonomous Government, which will be of great use. ”

Seeing that Mihlur was silent, Xiao Lieri smiled and said: "The matter of participating in the new government can be considered slowly in the future, this commander is tolerant to this point, whether to surrender or not, you should be quickly stopped." ”

Mihrul did not dare to hesitate, so he had to endure the humiliation and said: "We surrender." ”

513, the remaining 16,000 Russian troops in the city laid down their arms, walked out of the fortresses, batteries, barricades, cellars, houses and trenches, and surrendered to the officers and men of the 1st Group of the Chinese Army.

In the six-day strategic battle of the fortress, the 1st Army killed the enemy at the cost of nearly 10,000 casualties, captured 21,000 enemies, and consumed 500,000 rounds of various artillery shells......

515, the 10th Cluster Command was stationed in Ulan-Ude, and the 3rd Cluster was combined into the 13th Railway Cluster, and a large number of prisoners of war and local residents were requisitioned, and the 320-mile railway between Ulan-Ude and Slyudyanka was rebuilt with an unprecedented amount of +, laying the logistical foundation for the summer offensive scheduled for early June. By the day of the king's arrival in Ulan-Ude, 525, two-thirds of the renovation work had been completed—about 240 li.

This time, he returned to the front as the presidential marshal of the Northern Theater and commended Xiao Lieri's martial arts on behalf of Her Majesty the Empress......