In March 1914, the first large-scale "gas warfare" in history was officially born in the Battle of Ypre, which poisoned about 15,000 British and French troops and killed more than 5,000 people.

But at that time, although the British and French troops would be at a loss in the face of sudden poison gas, the professional soldiers of World War I would take various measures to deal with the erosion of poison gas.

And the Japanese samurai of this era did not know the concept of basic chemistry, and even if they saw chlorine wafting over, they did not know how to deal with it, and they might only treat it as an ordinary mist.

What's more, it was still midnight, and the darkness of the night concealed the arrival of the fog, and when the chlorine gas drifted in front of the eyes of the Tokugawa shogunate, they didn't even have a chance to shout.

At that time, the position of the Ypre salient in the First World War was only a criss-cross of trenches, and the density of personnel was far less dense than that of today's shogunate defense lines. Moreover, chlorine gas at that time had only just been developed, and it was far less powerful than the second-generation chlorine developed in the Far East.

Wherever the "Fog of Death" passed, most of the samurai and ashigaru on the Tokugawa shogunate defense line died in their sleep. Even if you wake up, you will be suffocated instantly, then dizzy, your breathing will be strained, and then the corners of your mouth will bleed and your limbs will twitch.

There was silence on the entire defense line, but it was terrifyingly quiet, and it was terrifying.

The defense line between Harima and Settsu was crowded with the elite of the Tokugawa Shogunate Army, as well as reinforcements sent by daimyo lords from all over Honshu Island, as well as a large number of civilians requisitioned by the Tokugawa Shogunate. There are more than 100,000 people, and the density of the number of people is too great.

When the chlorine gas gradually drifted through the frontline and slowly spread to the depth of the defensive line, the shogunate troops gathered behind the defensive line had no time to react. The mountain castles, flat castles, earthen forts, and fortresses on the entire defense line were stacked with corpses with painful faces. ended his life silently.

At the same time, the Tokugawa shogunate's coastal defense line near the mouth of the Yodo River in Osaka was also attacked by the air force of the Far East Army, and a large number of special weapons were dropped on the defense line and in and around Osaka Castle.

Because of the influence of the wind direction, the landing point of the chlorine tank was thrown at the defense line near the mouth of the Yodo River. It could only be chosen behind the shogunate army's coastal defense line, and although the effect was not as good as the Harima and Settsu defense lines, because the time of delivery was chosen at midnight and the density of personnel on the defense line was too dense, the results were far greater than previously expected.

The Air Ministry's special weapons in Osaka Castle and some castle towns are different from the chlorine gas used in Harima, Settsu, and the Yodogawa coastal defenses. It is the latest phosgene developed by the company's military factory and the Ministry of Chemical Industry.

This colorless poison gas is three and a half times heavier than air, and this colorless poison gas is ten times more lethal than chlorine gas. In addition to being asphyxiating. Phosgene can play a posterior role in causing the total collapse of the heart.

This newly developed special weapon, because it has just been developed, is relatively small in number. The Military Council began large-scale mass production only before the decision was made to launch the Korean campaign, but the phosgene of the stock was enough for areas such as Osaka Castle and Joshita Town.

Osaka Castle is located in Higashinari County, Settsu Province, Japan, and is one of the three most famous castles in Japanese history, along with Nagoya Castle and Kumamoto Castle. Also known as "Jincheng" or "Jincheng". The castle is about 7.8 kilometers in circumference, including the castle town, which is equivalent to the inner castle in the early Edo Castle period.

Year 1583. Toyotomi Hideyoshi built Osaka Castle on the land of the former Ishiyama Honganji Temple, with Osaka as the central city of his rule. During the Edo period, Osaka, an economic metropolis that was revived from a scorched earth, became known as the "kitchen of the world" throughout Japan. As a castle directly under the Tokugawa shogunate, successive shoguns served as the lord of Osaka Castle by themselves, and selected Osaka Castle Castle from among the important daimyo of the lineage.

The Tokugawa shogunate built a large number of defensive lines around Osaka Castle and also saw more than a dozen small Heijo castles. Connected by dense trenches, there are layers of earthen forts and forts, and heavy troops are deployed.

Because of the recent signs of an attack by the Satsuma Army in the Harima area, Osaka Castle has also strengthened its defenses. A large number of elite reserves were transferred into Osaka Castle to strengthen the garrison of the defense line here.

The airship brigade of the Air Force Department of the Far Eastern Military Commission carried out the mission of launching Osaka Castle. It was not a projection method like the two lines of the Tokugawa shogunate army, but a covert approach to engage the enemy.

More than a dozen airships turned off all light sources and, under the guidance of various ground guidance means arranged by the Far East Intelligence Department in Japan, quietly flew over Osaka Castle, and then slowly descended to the launch altitude and threw a large number of phosgene canisters to the ground. More than a dozen airships have also successfully completed the launch task in all directions of the castle town.

When the colorless gas spread with gusts of majesty, the defense lines inside and outside Osaka Castle, as well as the countless shogunate troops and Japanese civilians in the castle town, died silently on their beds, never to wake up again.

After the various airship brigades of the Air Force Department began to operate, Gao Jianguo boarded a Type 32A airship, and the Japanese Theater Command also followed him to the airship.

Gao Jianguo still attached great importance to the previous operation launched by the various units in the theater. When the reports of the various airship brigades came back one after another, the special weapons dropping operation was a complete success.

After receiving the report, Gao Jianguo also breathed a sigh of relief. But he still has no idea about the results he has achieved after the launch. He immediately ordered the Air Department to carry out a follow-up operation, sending ten unmanned reconnaissance aircraft teams to conduct further reconnaissance in the Tokugawa shogunate defense line.

Gao Jianguo anxiously waited for the results of the reconnaissance, and kept pacing back and forth in the airship pod, making the atmosphere in the theater headquarters extremely tense.

Suddenly, the communications staff officer, who had been wearing headphones and waiting for the results of the reconnaissance in front of him, suddenly shouted: "Commander, the UAV team of the Air Department has sent a telegram that the special weapon launch operation has been a complete success and the results are brilliant......"

As soon as his words fell, there was a burst of jubilation in the theater headquarters. Gao Jianguo also let out a sigh of relief, and a smile appeared on his originally gloomy face.

Gao Jianguo raised his hand and looked at his watch, nearly an hour had passed since the Air Department's launch operation, and under normal circumstances, poison gas and phosgene would dissipate within three to four hours after they were dropped. It does not conflict with the timing of the general attack of the troops.

Turning to Chief of Staff Lin Hua, he shouted: "Inform all units to prepare for battle, launch an attack according to the scheduled general attack time, and the main assault force must wear gas masks to prevent the soldiers from being eroded by the residual poisonous gas." (To be continued......)