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The Leipasuo defensive sector bunker No. 6 was built in spring 1939, according to the inscription on it made by guys from Karelia society. It was one of the more modern bunkers built in the 1930s, with two casemates connected by a underground corridor and barraks. The bunker is situated in some 100 meters east from Saint-Petersburg - Vyborg railway, some 100 meters north from Perovka (Peronijoki) river. It cannot be seen from the railway because of the thick forest, but the primary function of the bunker was to cover the railway by flanking machine gun fire. The fighting compartment lacks the front wall with gun ports. The bunker has the underground corridor some 20 meters long leading to the western casemate and other facilities. The corridor is well preserved, which cannot be said about the western casemate....I could not find any blueprints or plans of the bunker in Russian or Finnish sources.
The bunker was designated bunker 239 by the Red Army:
Captain Fedenko:
... in front of barbed-wire obstacles Peronjoki river ran along the front, some seven meters wide. Finns damed it up and it flooded area some five hundred meters wide and froze. After the ice became some twenty santimeters thick, the dam was destroyed, water ran from the flooded area under ice and the ice was left hanging on the small islands and hillocks in some three meters above the water. The hanging ice was covered by one meter of snow. People could walk on it, but it would not hold tanks.
On our side of the river we discovered minefields under ice, and non-freezeing swamps some three kilometers wide. The railway bridge was blown up and opposite to it there was a group of bunkers, which were protected, as we found out later, by walls of seven consequent steel plates 48 mm thick, bolted together.
The entire area in front of the bunkers was under machine gun, canon and mortar fire from the bunkers.
We had to break through the defensive line and destroy the enemy.
...Opposite to the Finnish bunker No. 239 on our bank of the river there was a small elevation covered by forest. Engineer platoon leader Shikov proposed to cut a glade in the forest and put the bunker under direct fire. The elevation was covered from the flanking machine gun fire of the other bunkers by the remains of the railway embankment.
The commanders approved Shikov's plan.
The next morning I was already lying in a snow trench on the elevation opposite to the bunker. Shikov and his engineers cut the glade in the forest during the night.
Artillery men rolled the canon into position and aimed at the fortification. Finnish bullets started knocking on the armor shield of the gun like peas, hissed above our heads. The snow started moving and hissing from long machine gun bursts from the bunker. The gun made its first shot. The shell exploded in some 100 meters from us. We saw a long tongue of flame shooting into the sky, splinters flew in our direction. The gun fired 25 shells, but every time we could see long red flames emerging from the bunker. It was invincible - the shells ricocheted from the sloped armored wall.
Finns opened mortar fire on us. Mines were hissing in the air, exploding next to us, showering us with snow. Four artillery men were wounded already. The canon was pulled back from the position. Shikov ran up to me with a red face covered with sweat.
- It's OK. We will get them anyway! - he shouted.
Using tree trunks for cover we started to examine the bunker.
Using the binoculars, we could spot a slight damage on the place where armor connected with concrete.
Artillery officer ordered to employ anti-concrete shells...
...As soon as we received anti-concrete shells, we rolled the 152mm gun in position opposite to the Bunker 239. The wide barrel of the gun pointed at the point-blank range at the small black spot at the bunker's basement. We started the "chiseling" of the bunker. With support from the divisional artillery, which was suppressing the mortars and distracting the attention of Finnish artillery bunkers, we opened fire on the spot where conrete connected with steel. The gun was firing at one spot. The flames were shooting into the air. Air shuddered from gunfire. I was observing the explosions from a shelter. I wanted to see the bunker die, but it still resisted.
The wounded artillery men were replaced again and again at the gun, but the fire did not stop. Finally, we saw smoke emerging from gunports of the bunker.
- Fire! - repeated the gun commander again and again, and several other shells hit the unwrapped hole. The lump of concrete and steel was silenced for good.
I saw the artillery men smiling.
Suddenly the neighbouring bunker 167 also became silent, although there were no signs of destruction on it.
After some time our infantry consolidated its positions in the silenced bunkers.
When I visited the destroyed fortifications later, I saw the fearsome power of our military equipment. The concrete ceiling 1.5 meters thick collapsed together with the 7 meters of soil on top of it. The steel walls were bended, and the in the neighbouring bunker 167 the steel plate bended and closed the gunport. Now it was clear, why this bunker also became silent...
(Fighting in Finland, Military Publishing House of People's Commissariat of Defence of USSR, 1941).
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Living quarters of Le6 bunker, partially preserved. In the right part of the picture you can see the collapsed roof of the bunker (completely covered by moss). Apparently, this is the part of the bunker that Captain Fedenko is mentioning in his story of the storm of the bunkers Le6 and Le7.