Tang Tianji then led his hot air balloon troops and boarded the ship from Yuguan without stopping, and followed the last route straight to the upper reaches of the Liaohe River.

His last combat operation was to burn a large prairie north of the Mongolian army camp.

And he was going to bomb the dams in the upper reaches of the Lightning River. The most suitable starting point should actually be in the lower reaches of the Lightning River.

Because the hot air balloon he is driving now can already move forward against the wind on a breeze day, and use the engine to increase the horsepower and fly for a short period of time.

But now the Lightning River is intercepted, and the river water downstream is retreating rapidly.

The steamboat on the river was also forced to retreat to the east of more than 200 miles, so Tang Tianji had to go around a long circle.

Now there are Mongolian troops north of Yanshan Mountain. If he advances from land to the hinterland of the Mongolian-controlled area with hot air balloons, he will never have any chance of survival.

This time, he sailed on the river on the first half of the journey by gunboat.

Escort with artillery makes it impossible to get to the land's cavalry.

As for the second half, we rely on hot air balloons to fly at an altitude that is beyond the reach of enemy weapons.

This time, Tang Tianji was full of anger and brought a full natural gas cylinder to fill the engine with fuel.

He also brought a 500-kilogram aviation bomb loaded with strong explosives and sailed from sea to the mouth of Liaohe.

Then, just like last time, he moved his equipment from the sea boat to the inland gunboat, and then accelerated toward the upper reaches of the Liao River with all his might.

...A few days later, in the Mongolian army camp, there were a bunch of strange things on the table in front of Temujin.

It can be seen that these things were originally extremely precise mechanical parts.

The above was burned black by flames and distorted by the huge explosion.

But Temujin could still see that the steel materials used on the machine parts were far more than those of the Mongolian steel.

The manufacturing is extremely precise and regular, and it is by no means possible for their craftsmen to do it.

Just over ten days ago, Shen Mo's hot air balloon troops flew over the Thunder Fortress and finally solved the mystery of the burning of the grassland for Temujin.

Because he knew that it would be impossible for three or five hundred people to set fire in such a big fire.

That must be the effect of dispersing a large number of troops and ignition at the same time.

But the grassland behind him was full of the home court where the Mongolian army galloped across the board. How could so many enemy soldiers get in and set fire?

So when the hot air balloons flew over his head, Temujin suddenly understood the answer to the puzzle.

It turned out that the plan to set fire to the grassland was completed with this kind of weapon flying in the sky! Later, Temujin's artillery loaded the shotgun and successfully knocked down a hot air balloon in the air. This was the result of people lowering the height and approaching the close reconnaissance.

Originally, Temujin was secretly happy. After he seized this thing, even if there was only one.

He could also hand it over to his craftsmen to make a large number of imitations.

With Temujin's financial resources and the number of craftsmen, he thought that the other party could build thirty, and he could build thirty thousand! When he attacked the Southern Dynasty's city, he could send his own balloon troops and use a large number of ten thousand enemies to blow the defenders in the city from a high altitude.

Such a prospect made Temujin extremely excited for a moment! But after a while, his expectations turned into disappointment.

The hot air balloon that was knocked down was detonated by the Song army soldiers above before it fell to the ground.

Then he was frustrated and discovered that judging from the residual parts scattered on the hot air balloon, this thing was definitely not forged by their Mongolian blacksmiths, which made Temujin extremely angry! Before this, he knew that the technological gap between his Mongolian and the Southern Song Dynasty was definitely not something that could be caught up overnight.

But he didn't expect that the two sides were so much different! Seeing that the complex and sophisticated parts were even more delicate than the jewelry worn by their Mongolian women.

Their Western Regional skilled craftsmen couldn't even polish a plane on them... This made Temujin feel like a fire in his heart, tormented and uncomfortable!... In addition, this was not just what made him feel secretly depressed.

After the enemy's hot air balloon flew over, Shen Mo would definitely know his plan to surround the Thunder Fortress with the water of the Lightning River.

The plan originally set up by Temujin was very exquisite. Under the control of his million-strong army, the Thunder Fortress was already hanging alone outside Yanshan and was cut off from their rear messages.

He cut off the river water in the lower reaches of the Lightning River, forcing the gunboats used for reconnaissance on the river to retreat, and also concealed his actions to build dams upstream.

Afterwards, while gradually storing water with a dam, he built four rammed earth fortresses in the southeast, northwest and northwest around the Thunder Fortress, and then connected the fortresses together with city walls, turning them into a circular huge earth city.

At the same time, he began to dig a deep ditch between the earth city and the Lightning River.

After about twenty days, after the water in the dam is fully stored.

He could dig a dam, turn the entire Tucheng into a lake, and trap this annoying Thunder Fortress alone in the center of the lake! Now this news must have been known by the enemy's commander Shen Mo, and Temujin was also worried about it.

Although he knew that Shen Mo could not have abandoned the Yanshan defense line and rushed out to fight his million-strong army plain, he still felt something was wrong in his heart.

Looking at the metal parts in front of him that were emitting a strange smell, Genghis Khan's eyebrows gradually frowned.

Fortunately, he did not hesitate and launched this unprecedented war! If the Song Dynasty was allowed to develop in this way, I am afraid that in another ten years, the Mongols would not be able to protect themselves!... At the same time, Yu Jie, Bu Yucheng, Blood Hands Liu Ming and Guo Xiama, who were trapped in the Tucheng, were all watching Shen Yaoguang's sister lying on the desk and calculating intently.

Now they are also anxious.

Sister Shen Yaoguang is comparing a seasonal flow table of Lightning River on the desktop to estimate the water storage capacity of the upstream dam.

These days, the generals and officials in the Thunder Fortress have been in a torment.

Because their current situation is unknown to the rear, the tricks Temujin has slowly emerged.

At the beginning, when Shen Yaoguang climbed the watchtower and observed outward, he found that something was wrong.

Because the downstream of the Lightning River was blocked, the steamship could no longer approach the Thunder Fortress.

However, according to Shen Yaoguang's prediction, the subsequent flooding of rivers did not arrive at all.

This is what the river water is like. If you stop it downstream, it will naturally flow everywhere without a place to go.
Chapter completed!