On the evening of February 22, in the tunnel inside the 138 Heights, Cai Xiangyu, the battalion commander of the 1st Battalion of the 1st Regiment of the 1st Brigade of the 31st Division of the Dingbei Army, who was guarding the 138 Heights, took a flashlight to shine a map of the interior of the 138 Heights in his hand, and whispered to several company commanders around him: "We are now under the feet of the Russian army, tell the soldiers that we must hold out here for more than 10 days, so that the soldiers must be quiet no matter what they do, so that the Russian army will not notice that we are still in the 138 heights." ”

Although the Russian 63rd Army and the 64th Army occupied the 137th Heights and 138th Heights, and searched the entire 138 Heights in a stall manner, and did not find the Dingbei officers and soldiers who missed the net, what the Russian army did not know was that in the deeper places of the 138th Heights, there were well-developed tunnels in all directions, and the places where these tunnels communicated with the pillboxes on the surface of the mountain, as well as some of the hidden forts, had been blocked by the Dingbei Army itself.

Even if the Russian army occupied these fortifications, it did not find the entrance to the tunnel, and there were even many hidden hidden bunkers inside the mountain, and the officers and soldiers of the Dingbei Army did not shoot and kill the charging Russian army, so that the Russian army still has many hidden forts inside the mountain that have not been discovered.

Battalion commander Cai Xiangyu counted the casualties of the troops, and there were nearly 800 people on the 138 heights that had been strengthened by troops, but after today's not fierce defense, the casualties of the troops were good, with less than 60 killed and more than 40 wounded, which means that there are nearly 700 people in the tunnels of the 138 heights who can launch a counteroffensive against the 138 heights in the near future.

Although there are less than 700 troops, and there may be thousands of defenders of the Russian army on the 138 heights, the battalion commander Cai Xiangyu is very confident that he will complete the task and regain control of the 138 heights after the order of his superiors.

And the reason why Cai Xiangyu is so confident is because the officers and soldiers of the Dingbei Army left a back hand before retreating into the tunnel, among the bunkers and bunkers that deliberately gave up, the officers and soldiers of the Dingbei Army buried some small explosive packs, and even the fuse was placed in the steel pipe and buried in the ground, and when the counteroffensive was launched, as long as these small explosive packages were detonated, the Russian troops in those bunkers and bunkers could not think that a few would survive, and they would not destroy these bunkers and bunkers. The officers and soldiers of the Dingbei Army can reuse these pillboxes and bunkers to block the Russian army.

Early in the morning of the 23rd, the Russian 65th Army and the 66th Army, under the cover of Russian artillery, launched a fierce attack on the other two mountain fortifications on both sides of the road, which were immediately behind the 137th and 138th heights, and cleared the pillboxes and bunkers of the Dingbei Army little by little, regardless of casualties. In fact, the Russians don't have to be like this, they just don't fill it with human lives, and the officers and soldiers of Dingbei guarding the mountain fortifications will gradually give them the fortifications little by little, but unfortunately they don't know that at night, the Russian 65th Army and the 66th Army were satisfied that after paying more than 6,000 lives, they occupied 2 mountain fortifications All the fortifications that the Russian army could find.

And today, the rest of the Russian Siberian Front Army, with the exception of the two corps guarding the rear, the 69th Army and the 70th Army, all came to the Svobodny front.

On the 24th, the commander of the 2nd Russian Siberian Front, Oleglev, ordered two more corps to launch an attack on the mountain fortifications occupied by the two Dingbei armies on both sides of the road......

This offensive of the Russian army lasted until the night of March 1, when all 13 mountain fortifications on both sides of the middle road of the mountain fortification group outside the inner city of Svobod were occupied by the Second Siberian Front, and the road leading to the inner city of Svobod was opened by the Russian army.

Although the 13 mountain fortifications of the Dingbei Army did not resist desperately, but the losses of the Russian army are still a lot, the capture of these 13 mountain fortifications The number of Russian soldiers killed exceeded 40,000, and nearly 10,000 people were wounded, but the commander of the Russian army Oleg was very satisfied, and he even sent a good report to the commander of the Siberian theater of operations, Kuropatkin, saying that he had captured part of the mountain fortifications of the Dingbei Army outside the inner city of Svobod, and opened the road to the inner city of Svobod, and the inner city of Svobod was just around the corner.

In fact, the Russian army also launched an attack on those mountain fortifications outside the 13 mountain fortifications on both sides of the road, but the officers and soldiers of Dingbei of these mountain fortifications did not receive the order to weaken the defense, and launched desperate resistance to the attacking Russian army, although the artillery unit of the Dingbei Army hidden in the middle of the mountain fortification group, in order to make the Russian army mistakenly think that the artillery unit of the Dingbei Army here has been almost wiped out by the Russian artillery, the passage in the middle of the mountain fortification group was safely passed, and there was no artillery bombardment of the attacking Russian army, However, with the perfect defense system on the mountain fortifications, the Russian army returned with several attacks and lost nearly 10,000 troops.

In the end, even the commander of the Russian army, Oleglev, did not order the troops to launch an attack on other hills other than the 13 mountain fortifications, anyway, their purpose was to open the passage to the inner city of Svobod, as for why the other mountain fortifications were so fiercely resisted by the Northern Army, the commander Oleg Lev did not think deeply, he only thought that it might be that the offensive forces invested were insufficient, he no longer had the heart to consider these unconquered mountain fortifications, and his mind was now on the inner city of Svobod, Prepare to concentrate the main forces of the 2nd Siberian Front and take in one fell swoop the inner city of Svobod, which is the main communication route, which is also the only way to the Far East.

As for the other mountain fortifications that are still occupied by the Dingbei army, Oleg Leviv thinks that it is irrelevant, and now his army can already be under the inner city of Svobod, which is equivalent to cutting off the supply of these Dingbei army, and after a long time or after his own army captures the inner city of Svobod, he can also besiege these mountain fortifications to death.

Oleg Lev ordered the troops of the Russian 31st Army and the 32nd Army, which had not participated in the offensive, to station 13 mountain fortifications on both sides of the road to prevent the counteroffensive of the Northern Army from other mountain fortifications and protect the road leading to the inner city of Svobod.

Then, from March 2, in order to launch an offensive against the inner city of Svobod, the main forces of the Russian Siberian Front began to move forward, opening the road in the middle of the Guò mountain fortification group, and in the middle of the mountain fortification group and the inner city of Svobod, another camp was established, and one Russian infantry regiment after another was stationed in this camp, and the Russian artillery unit and the only tank armored division were also stationed here.

By 5 March, the Russian Second Siberian Front had gathered nearly 500,000 troops in the camp between the mountain fortifications and the inner city of Svobod.

On the first day of the attack on the mountain fortifications, because of the airship bombing, it lost 20,000 people in one day, and 40,000 people lost another 40,000 people on the 13 mountain fortifications on both sides of the middle road of the mountain fortifications, and nearly 10,000 other mountain fortifications on both sides of the attack, which means that the strength of the Russian Siberian Second Front has been reduced to 700,000.

Moreover, among these 700,000 people, nearly 30,000 were injured for various reasons, and at present, it is basically impossible for the first Russian army battalion to participate in the battle again, so that the Russian Siberian Second Front can only use more than 670,000 troops.

Of these more than 670,000 people, there are more than 60,000 people in two armies guarding the rear road of the Second Russian Siberian Front, 2 full armies of 60,000 people guarding the 13 mountain fortifications that have been captured, and 2 full armies guarding the large camp 10 kilometers north of the original mountain fortification group, so that the commander Oleg Lev can only gather nearly 500,000 troops to launch an attack on the inner city of Svobod, but he believes that these forces are enough, so on March 5 he waved his troops and began to launch a fierce attack on the inner city of Svobod.

The Dingbei Army built a large number of pillboxes and many trenches according to the terrain in the north outside the inner city of Svobod, forming two fortifications, and the inner city of Svobod was surrounded by cliffs, so if the Russian army wanted to continue to advance towards Vladivostok, it must capture the inner city of Svobod, and the Russian army could not break through the two fortifications in the north, and did not want to launch a direct attack on the inner city of Svobod.

Therefore, Commander Oleg concentrated almost all the more than 2,000 guns with a caliber of 75 mm in the front army, launched a fierce artillery bombardment of the first fortification of the Dingbei Army for 10 minutes, and then directly sent the strength of 1 infantry division to charge the first Dingbei military fortification, and equipped this infantry division with a part of the Russian army's heavy steam tanks and armored vehicles, and even when the Russian assault unit approached the first Dingbei military fortification, he still ordered the artillery unit to carry out artillery bombardment regardless of accidental damage.

The artillery unit of the Dingbei Army in the inner city of Svobod has 1 heavy artillery brigade and 4 heavy artillery regiments, as well as a large number of 75 mm artillery, adding up to more than 500 guns, although it is not comparable to the number of Russian artillery, but it also brings very large casualties to the Russian infantry.

Here, the artillery of the Dingbei Army adopts the method of changing positions after firing a few shots, and the artillery units of the Russian army carry out artillery guerrilla warfare to avoid a tragic artillery battle with the artillery of the Russian army.

When the first infantry division of the Russian army to attack was unable to capture the first fortification of the Dingbei Army because of too many casualties, the Russian commander Oleg Lev ordered this infantry division to retreat and replace it with another infantry division and some tanks and armored vehicles to launch a charge......

The officers and men of this division showed strong combat effectiveness, using the pillboxes and trenches of the first fortifications, firmly blocking the 500,000 troops of the Russian Siberian Second Front for three days of attack, and then withdrew from the first fortification in the north outside the inner city of Svobod and returned to the inner city of Svobod. R1152