After the outbreak of the Pacific War, the Japanese navy was almost entirely involved, the pressure in the waters near China was sharply reduced, and the Nationalist government also reorganized the remaining ships and reorganized several naval fleets, including the Fourth Fleet, which once had a brilliant record, and Chen Ce was also appointed commander of the Fourth Fleet.

After receiving the news that the main force of the Japanese Navy's Northern Fleet was coming, Chen Ce's Fourth Fleet only had two cruisers, "Zhongshan" and "Weiguo", as well as some frigates and torpedo ships.

First, he sank nearly 200 requisitioned merchant ships, fishing boats, and old warships with their guns removed, laden with boulders, leaving only a narrow channel that he knew about. A number of mine defense lines have been laid on the surface of the water, and more than 2,000 mines have been laid in the waterway of Dalian Port alone.

Secondly, it is necessary to step up the repair of trenches and the laying of artillery. Chen Ce purchased a batch of cement and steel plates from nearby to strengthen the fortifications of the forts.

Dalian Port was defended by Chen Ce as three lines: the outermost Gangwan Fort was the first line, the Gangpu Fort was the second line, and the Gangxing and Ganglong Forts were the third line.

According to the normal armament, it should be the cannon in the back and the small cannon in front, Chen Ce knew that his strength was insufficient, so he came up with a "walnut shell" odd array that was the outside and hollow on the inside: the heavy firearms of the fort, that is, the coastal defense artillery left after the devils were repulsed, were all deployed in the front line, and the batteries behind were only equipped with light artillery to attack the enemy ships that went around the harbor and behind the harbor.

The coastal defense cannon left by the devil has a long body, thick pipe wall, long range, and great power, although it was somewhat damaged in battle, but after repair, it still maintains strong firepower. Equipped with sufficient ammunition and well-trained gunners, relying on the steep terrain, it became a powerful weapon for Chen Ce to retreat from the enemy.

Chen Ce also urgently requisitioned a batch of antiaircraft guns from the troops entering Dalian, equipped with three companies, and placed them at various key air defense points in the fortress to strengthen the anti-aircraft firepower.

At 16:00 p.m. on April 11, 1944, several Japanese planes flew over, and Chen Ce immediately realized that the intelligence was wrong, and there were still aircraft carriers hidden in the Northern Fleet dispatched by the Japanese army. Japanese planes flew low to reconnoiter Dalian Port, Chen Ce ordered the troops to shoot with anti-aircraft guns, the Japanese planes retreated, and then bombers flew to bomb, and the naval battle of Dalian Port began.

The news from the outer patrol ship confirmed Chen Ce's guess that there was indeed an aircraft carrier "Onimaru" in the Japanese Northern Fleet, and Chen Ce was not timid, but used the shore guns of the third-line defense to cooperate with the naval guns, and the soldiers were familiar with the waterways, as long as the Japanese ships were close to the batteries, they would fire at any time. Although the cruisers "Zhongshan" and "Weiguo" were inferior to the Japanese warships, they were moving in familiar waters, relying on dense islands and reefs and tortuous shipping lanes, and were mobile and flexible.

The Japanese army repeatedly used aircraft for reconnaissance, and the main positions and batteries were covered by anti-aircraft guns, and they did not dare to fly low, and the effect was not good. On April 12, because of his meritorious service, a Japanese plane forced its way into the defenders' anti-aircraft artillery area and was immediately shot and crashed.

The huge Japanese fleet Chen Bing was off the coast of Dalian Harbor and faced the Fourth Fleet for five days, and it was always difficult to surpass half a step. Rear Admiral Nakazawa, chief of staff of the Japanese North Sea Fleet, who commanded the battle, ordered the heavy cruiser "Nachi" and the destroyers "Feng" and "Yu" to detour to Lushun in an attempt to open a gap from there, but they were repelled by the Kuomintang troops in Lushun based on the fortress and intensive artillery fire, and the "Rain" destroyer was even scarred by the explosion and lost its combat capability.

Seeing that Port Arthur was strong and difficult to attack, Nakazawa ordered his troops to turn to other breakthroughs, frequently attacking the surrounding islands and military points, but they were never able to tear open the gap.

On the afternoon of 17 April, the two cruisers, "Zhongshan" and "Weiguo," opened fire on the air due to poor communication with the command. After receiving this important information, Nakazawa Yu deduced the anchorage of the two capital ships of the Fourth Fleet based on the bombing point of the antiaircraft guns, and sent three destroyers, the Feng, the Lei, and the Den, to lurk near Diamond Bay in the north of Dalian Port at night that night.

At dawn on the 18th, the "Zhongshan" and the "Weiguo" made routine patrols, with the "Zhongshan" taking the lead, and the "Weiguo" following behind, departing from Dalian Port and heading for the Longtoushan Fort in the north, until they reached the vicinity of Diamond Bay.

The Japanese ships were obviously prepared, and the two cruisers, "Nakayama" and "Weiguo," had not yet formed battle formation, and the Japanese artillery shells had already come at them.

The "Zhongshan" hurriedly returned fire with the only head gun in front of the ship, but soon after the battle began, the hull of the ship was hit, the rudder chain was broken, and the battleship involuntarily rushed outward by inertia.

"Patriotic Defense" received the signal, the artillery was all in position, accelerated its advance, and attacked the enemy ships.

The Japanese ships divided their forces and attacked the "Nakayama" with the "Wind" and "Thunder", and the "Den" concentrated their firepower on the "Weiguo". At this time, Chen Cecai, who was sitting in Dalian Port, received a report and ordered the Diamond Hill Fort in Diamond Bay, which is 140 meters above sea level, to immediately open fire.

Suddenly, the sound of artillery on the sea shook the sky, and the smoke of gunpowder filled the air. Eight 16-centimeter cannons on the "Den" fired at the "Patriotic Nation" one after another, and the four 15-centimeter main guns on the "Patriotic Signal" hit several of the "Den" guns, one of which directly hit its chimney, but unfortunately the shells did not explode. Soon, the "Patriotic Nation" was seriously penetrated into the water and could no longer support it, so it had to turn the rudder and retreat.

The remaining "Zhongshan" was left alone, and all the enemy's guns were poured on its deck, and in just a few minutes, the stern of the "Zhongshan" was pierced, and the battleship sank.

Just when the Japanese ships thought that they could take advantage of the victory and seize the beach to occupy the Diamond Hill Fort, Chen Ce rushed to Diamond Bay and showed his three killer moves———

First, with a 20-centimeter cannon, he opened fire on the three troop carriers that the Japanese were laying anchor. More than 5,000 army soldiers on three ships were preparing to change to seize the beach, and after being hit by several guns, a large number of dead and wounded people on the deck, dragged the smoke of the fire, and fled from Diamond Bay in disarray.

Nakazawa Yu never expected that the three troop carriers would be hit, because according to the information provided by Komanbara Taro, the maximum range of the artillery of the Diamond Hill Fort was only 15 kilometers, and the place where the three troop carriers were moored was about 18 kilometers away from the battery, but Nakazawa Yu didn't know that Chen Ce had several experts in artillery fire around him, and quietly adjusted the artillery, reduced the warhead charge, increased the elevation angle of the artillery, and increased the range of the cannon to 20 kilometers.

The second move was to order Lieutenant Colonel Han Chun-ying to lead six new-type torpedo boats to pounce on the three troop carriers, and the dispatch of the torpedo boats attracted the attention of the Japanese ships, and the three destroyers, including the "Den," had to give up attacking the wounded "Zhongshan" and "Weiguo" and turn around to block the torpedo boats.

Suddenly, hearing the deafening roar of aircraft, more than a dozen fighters volleyed in, which was Chen Ce's third killer move, and notified the air force to support.

Seeing that the situation was not good, the Japanese ships immediately stopped their attack on Dalian Port and retreated to the anchorage of Bangchuidao. Chinese fighters bravely pursued and launched several attacks on Japanese ships, and two destroyers, the "Den" and the wounded "Rain," were destroyed and sunk by Chinese fighters, and six troop carriers were destroyed.

Yu Nakazawa looked at the few and scarred bombers on the deck on the aircraft carrier "Onimaru", listening to the soldiers reporting the tragic battle reports from everywhere, he closed his eyes in pain, and wanted to give the order to retreat, but after thinking about it, he held back, he was still waiting for a hope, waiting for the news of victory from the "Nachi".

On the evening of 14 April, the captain of the "Nachi," Takahiko Kiyota, the captain of the "Nachi," took the heavy cruiser "Nachi" and seven troop carriers to the port of Nampo, and after a four-day voyage, finally arrived outside the port of Nampo on the evening of 18 April; as long as the three divisions and regiments successfully arrived in Korea, they could use the DPRK as a springboard to enter the three northeastern provinces of China, and as a surprise force, they might even turn the situation in the northeast in one fell swoop.

The port of Nampo was silent, the icy sea breeze made people hide in their houses, and the sparkling ripples on the sea surface loomed in the searchlights of the Japanese army in the harbor. Bian Zhengbei and 20 members of the 3rd Column Commando were waiting on a Japanese port patrol boat, and two hours earlier, they quietly snatched the patrol ship from the Japanese army, and according to the time calculation, a Japanese fleet would come to Nanpu Port tonight.

Four days ago, the comrades of the underground party discovered at sea that a Japanese fleet was making a detour from Dalian Port to the east, and after following it for half a day, they found that the destination of this fleet was very likely to be North Korea, and that Nampo Port, as the largest port in Korea, was very likely to be the place of call for the Japanese army.

After receiving this news, Lin Junxiong discussed with Qiao Xinyu and a few others, affirmed this possibility, and immediately ordered the Third Column to send an assault team to reconnoiter the details of the situation and wait for an opportunity to give a secret attack.

"Captain, the devil's ship is here!" One of the team members pushed Bian Zhengbei, who was recuperating with his eyes closed.

Bian Zhengbei opened his eyes suddenly, looked into the distance, the sea in the distance really flashed some light, he took the telescope and looked, sure enough, it was a big ship and several small boats.

"Come over, and the 3rd, 12th, 15th, and 18th will come with me in a moment, and the others will wait for orders." Bian Zhengbei secretly made up his mind in his heart, some time ago, Lin Junxiong sorted out the classic battle examples mentioned the Ryukyu People's Revolutionary Army's battle to annihilate a division of the Japanese army in the south port of Okinawa Island, although it could not occupy the South Port battery to replicate that battle, but Bian Zhengbei still remembered the last part of the blood shadow blowing up the Japanese ship, the Ryukyuan people are not afraid of death, will the Chinese be afraid?

Before the trip departed, he and his brother Bian Zhengnan gathered together as if they were saying goodbye, Bian Zhengnan also smiled and said that what he said was strange, as if he wanted to say goodbye, Bian Zhengbei had a smile on his face, but he said to his brother to take care in his heart.

Takahiko Kiyota saw that it was his patrol boat and asked the soldiers to allow the patrol boat to approach. Bian Zhengbei immediately took the No. 3, 12, 15, and 18 commandos to the "Nachi", and although the other party showed the relevant documents, Bian Zhengbei still pleaded with Takahiko Kiyota to forgive him, and in order to ensure the safety of the port, he asked for a careful inspection of the "Nachi".

Kiyota Takahiko was furious, but Bian Zhengbei always insisted, the two sides argued, and the stalemate lasted for a long time, Kiyota Takahiko nodded appreciatively, expressed satisfaction with the other party's responsible attitude towards things, and asked the soldiers to lead Bian Zhengbei and a few people to the "Nazhi" to look around.