On the outskirts of Vladivostok, there were no anti-aircraft guns on the second hill bombed by the Hercules, Mercury, Venus and Mars, but after the three large airships bombed this hill for a while, the 800 kg of bombs they carried were exhausted, so they had to return to Russky Island first to replenish the bombs.

The Hercules supership carried 75 tons more bombs than the three large airships, so it continued to bomb the second hill fortification of the Russian army below.

Lin Daxin also sent a telegram to several division commanders of the Dingbei Army on the outskirts of Vladivostok, agreeing that the infantry of the Dingbei Army did not need to rush to seize the mountain fortifications on the periphery of Vladivostok, and could wait for the airship troops to bomb all the 36 mountain fortifications and destroy most of the fortifications built by the Russian army, and then the infantry of the Dingbei Army would launch another attack and occupy the entire 36 mountain fortifications on the periphery of Vladivostok.

The airship detachment consisting of the supership Heliostok, the Jupiter, Saturn, and Uranus airships, while bombing the outer mountain fortifications of Vladivostok, flew high in the air of the port of Vladivostok and began to bomb the remnants of the Russian fleet.

The Helios supership carried 800 kg bombs, while the other three large airships carried 300 kg and 100 kg bombs.

The whole bombing process was not very smooth, because the port of Vladivostok was no longer helpless against high-altitude airships.

At this time, four 47 mm caliber balloon guns, that is, anti-aircraft guns, had been placed in the port. In addition, last night, the Russians transformed a total of more than 20 small-caliber rapid-fire guns on some of the remaining warships into anti-aircraft guns that can shoot at the air, so when the airships bombed, the anti-aircraft fire of the port fired fiercely at the four airships.

The largest caliber of these anti-aircraft guns is only 57 mm, and it can't penetrate the alloy armor of the 2000-meter-high airship gondola compartment, but these anti-aircraft guns have brought a great threat to the airship's airbags, although the airbags of the airship are divided into hundreds of small airbags, and there are several small airbags leaking, which cannot affect the normal flight of the airship at all, but if there are more small airbags leaking, then the airship will not be able to fly normally.

Moreover, the shells of these modified small-caliber anti-aircraft guns are not specialized anti-aircraft shells, and they cannot automatically explode in the air with a delay at all, so that many shells of small-caliber rapid-fire guns did not hit the airship, but fell back directly and exploded on the Russian warship, but the Russians could no longer care about accidental injury, and fired continuously at the airship in the sky with the most fierce firepower.

As a result, the 4 airships, not even the bombs of the 3 large airships, had to retreat, because the airbags of each airship have been opened by the Russian anti-aircraft guns many holes, if this continues, the airbags of the 4 airships may add more holes, affecting the normal flight of the airships.

So Zhang Heng, the captain of the Helios supership and the head of the airship detachment, had no choice but to order the four airships that had not finished dropping the bombs to return to Russky Island immediately.

Although the four airships left the port of Vladivostok unwillingly, the commander of the First Pacific Fleet of the Russian Navy, Makarov, was still grim-faced, and the bombing of the four airships for a short time still dealt a heavy blow to the Russian fleet in the port of Vladivostok.

The Retvizan-class all-steel battleship Ustin, which was already seriously injured, was parked at the pier in the harbor and was selected by the Helios supership as the first target for bombing, and four 800-kilogram bombs were dropped on it in a row, and as a result, all four bombs hit the Ustin, not only detonating the two ammunition silos in the ship's body, but also detonating dozens of 381-mm torpedoes in the torpedo launch bay at the bow of the ship. sank into the sea of the pier. Because the water depth of the pier is only a dozen meters, part of the hull is also exposed to the sea.

The Borodino-class all-steel battleship Alexander III was also seriously injured in the mine array, and this time it was flown overhead by the Helios supership and dropped 4 800-kilogram bombs, although Alexander III also wanted to start to avoid the bombing of the airship, but an all-steel battleship like it didn't want to start for half an hour, and as a result, 3 bombs fell on the top of the Alexander III, and the deadliest one of them penetrated the 76 mm thick deck armor of the Alexander III, Directly penetrated the 2 layers of steel plates in the hull, drilled into the ammunition compartment of a main gun shell, and detonated hundreds of 305 mm shells inside, and after a rumbling explosion, Alexander III also broke into two and sank into the sea at the dock, and part of the top of its hull was also exposed to the sea.

The Petropavlovsk-class ironclad battleships Petropavlovsk and Poltava, with a displacement of 9,000 tons, were also sunk in the sea at the port dock of Vladivostok with 800-kilogram bombs from the Helios supership.

The other three large airships also sank the Admiral Ushakov-class old ironclad ships Admiral Ushakov and Admiral Xeniavin, with a displacement of 4,648 tons, in the sea at the port dock of Vladivostok.

Three other large airships sank two protective cruisers, four torpedo boats and two small gunboats.

The other main warships of the First Pacific Fleet of the Russian Navy were not sunk and most of them were seriously injured, mainly because the warships were parked in the harbor docks, and when the airships bombed, it was too late to start up and avoid the bombing.

Makarov, commander of the First Pacific Fleet of the Russian Navy, originally thought that with the four 47 mm caliber anti-aircraft guns allocated by Governor Alekseev, plus more than 20 small-caliber rapid-fire guns on the warship overnight, he should be able to resist the bombardment of the airship.

In a battery of the coastal defense guns of the port of Vladivostok, Governor Alekseev looked at the four airships in the distance, his face was as gloomy as black charcoal, and the more than 100 large-caliber coastal defense guns in the port of Vladivostok could only look at the four airships that were bombarding indiscriminately in the sky, and the warships of the First Pacific Fleet of the Russian Navy were sunk in the harbor, and only the four 47 mm caliber anti-aircraft guns newly placed on the shore of the port kept firing at the four airships.

Governor Alekseev said to Pagiritav, the staff officer of the Governor's Palace, who was with him: "Let the Vladivostok Ordnance and Machinery Institute speed up the transformation of anti-aircraft guns, the more the better, otherwise we will not want to keep these warships left!" ”

Pagilitov, that is, Hu Dayong, an agent of the Northeast Military Intelligence Bureau, nodded with a heavy face, in fact, he was already happy in his heart, it would be good to blow up and sink all your old warships!

On Russky Island, Lin Daxin frowned when he looked at the 4 airships that came back from the bombing of Vladivostok Port in front of him, the airbags of these 4 airships were no longer bulging, and the Russian air defense guns had made multiple holes in the airbags, which made the helium in the airbags run a lot.

Lin Daxin decisively said to Zhang Heng, the captain of the Helios supership: "These 4 airships are not suitable for bombing missions anymore, you immediately take these 4 airships back to the Shenyang Arsenal, where you can repair the holes that the airbags have been punched out, and then you go to the chemical factory, fill the helium in the airbags, and then wait for my order in Shenyang!" ”

Lin Daxin did not expect that the Russians in Vladivostok would be able to transform a lot of anti-aircraft guns so quickly, which would bring a lot of trouble to the bombing of the airship troops.

Sure enough, the Hercules, Mercury, Venus, and Mars airships were also attacked by Russian anti-aircraft guns when they bombed the mountain fortifications on the periphery of the third Vladivostok.

The mountain fortifications on the periphery of Vladivostok are relatively large hills, and the fortifications inside the mountain even installed two 240 mm heavy guns, and the Russian defenders have reached more than 6,000 people. So for such an important mountain fortification, the commander of the city defense of Vladivostok, Willistov, put 4 of the 12 anti-aircraft guns assigned to him on this hill.

Although the 4 airships finally bombarded this mountain indiscriminately, basically blowing up most of the fortifications of this mountain, and even 3 of the 4 anti-aircraft guns were destroyed in the bombing, but the airbag of the Mars large airship in the 4 airships was hit by the anti-aircraft guns in many places, and the helium in it was lost a lot, although it did not crash, but it also affected the normal flight.

After the Mars airship flew back to Russky Island safely, Lin Daxin also ordered the Mars airship to stop the bombing mission.

Lin Daxin sighed and said to several fleet commanders of the Northeast Navy around him: "It seems that the bombing with airships will not last long, and the Russians in Vladivostok will definitely have more and more anti-aircraft guns transformed, and it will be impossible for our airships to bomb easily!" ”

Lin Daxin immediately informed Zhang Guoxin, the commander of the airship unit, that if he was attacked by the Russians' dense anti-aircraft artillery, he should retreat immediately and not fight hard, otherwise the loss of any 1 airship would be enough for Lin Daxin to feel distressed for a while.

The remaining three airships, the Hercules supership, the Mercury large airship and the Venus large airship, were dispatched several times, and in one day, the airship troops carried out intensive bombardment of five mountain fortifications, and most of the fortifications of the five mountains around Vladivostok were blown up, especially the hill before the earliest bombardment, and another mountain, all the fortifications on the mountain were blown up.

The Russian Ordnance Repair Institute in Vladivostok rushed to work day and night, and the next day the remaining three airships bombed the mountain fortifications on the periphery of Vladivostok, and basically every mountain fortification had anti-aircraft guns.

The three airships had not finished bombing the sixth mountain fortification, because the airbags of the Mercury and Venus airships had been hit in many places, which had affected the flight, and Zhang Guoxin, the commander of the Hercules supership, saw this situation and immediately ordered all three airships to retreat and fly back to Russky Island. R1152