The current strategy of Jiannu is to either dig a tunnel and blast it directly with gunpowder, or dig a tunnel and extend it under the slope protection, and then hollow out the outer slope protection bit by bit from the bottom to clear the firing range for the Hongyi cannon.

If you want to blow up the gun platform, you can divert sea water to prevent it.

But if the Jian slaves just want to hollow out the slope protection, they will face a real test.

At that moment, Yan Yingyuan hurriedly got off the watchtower, and then gathered the few scholars who had stayed at Dagukou.

"Jiannu has changed his tactics, and we must also make corresponding adjustments. The first priority now is to strengthen the left and right gun platforms and the rammed earth walls at Dagukou."

"I boiled all the 1,000 shi of glutinous rice I brought."

"After cooking, mash it all and mix it with sand, clay and lime slurry to make a triple soil."

"Then use Sanhe soil to build a rammed earth wall for the left and right gun platforms. The rammed earth wall at Dagukou also needs to be re-reinforced with Sanhe soil. The wall must have a large inclination of forty-five degrees."

"A large inclination angle of forty-five degrees?" Some scholars questioned.

"With such a large inclination, Jiannu could rush up by stepping on the protective wall."

"Don't be afraid when Jiannu rushes forward." Yan Yingyuan said, "What you are afraid of is Jiannu's Hongyi cannon! If it is not made at a steep angle, even the Sanhe soil with glutinous rice juice added will not be able to withstand the Hongyi cannon."

It's the lesser of two evils.

…

The next day, the Ming army's unusual behavior aroused the vigilance of Jiannu sentries.

Dorgon and a few hardcore traitors immediately went up to the towering well railing to see what was going on.

Through the field of view of the telescope, we can see that the Ming army at the entrance of Dagu and the two gun platforms in front are stirring the Sanhe soil, and then using the Sanhe soil to pound and build the retaining wall.

Then, Dorgon and the others discovered that the cannon platform and the protective wall at Dagukou had a large inclination.

"It's strange, the inclination of the protective wall is so big that even the Eight Banners warriors can step on the wall and rush up." Ning Wanwo said in confusion, "Has there ever been a city wall with such a large inclination in China since its historical records began?"

"But there were no red cannons in ancient times." Hong Chengchou said solemnly, "This is obviously the lesser of two evils. Although the steeply angled city wall cannot stop the impact of the Manchu warriors, it can withstand the bombardment of the red cannons!

"

"It seems that Yan Yingyuan has seen through our intentions." Dorgon's face fell.

"It doesn't matter if you see through it." Hou Fangyu said with a smile, "No matter how steep the slope angle of the Sanhe earth retaining wall is, it can only block the red cannon for a while. As long as the Eight Banners and Han troops continue to bombard without hesitation of ammunition, sooner or later they will be able to blast away the retaining wall.

, or take ten thousand steps back, it doesn’t matter even if the red cannon can’t blast through the protective wall, you can directly order Bao Yi to continue digging tunnels, and directly collapse the Ming army’s gun platform and even the protective wall at Dagokou! Here we go.

Let’s see how the Ming army defends it at this time.”

Hearing this, Dorgon breathed a sigh of relief.

The situation is still under control.

…

At the same time, Xu Yingwei, who was far away in Gaizhou Guard, was not idle either.

It took Xu Yingwei ten days to repair the city wall of Gaizhou, and built eight large gun towers based on the city wall, one outside each of the four city gates, and another gun tower outside each of the four turrets.

This formed a two-level defense system. The first level was Gaizhou City, and the second level was the eight peripheral gun towers.

There are still gaps between the eight gun towers. Jiannu can rush directly to the wall of Gaizhou City through the gaps. But if Jiannu really does this, he will face Ming army firepower from all directions, and there will be no way to hide.

Place to hide.

When the entire defense system took shape, Xu Yingwei obviously breathed a sigh of relief, and now he was waiting for Jian Nu to attack.

However, the final result may disappoint Xu Yingwei, because there will be no more Jiannu to attack Gaizhou Guards.

Dorgon had listened to the advice of Hong Chengchou and other die-hard traitors, and was determined to concentrate all his efforts on competing with the Ming Dynasty in the Central Plains, so it was impossible to send troops to attack Gaizhou Guards in a short time.

After waiting for several more days, he found that no Jian Nu had reached the Gaizhou Guard, so Xu Yingwei began to send out reconnaissance cavalry to conduct reconnaissance, focusing on the Liaoxi Corridor and the Haizhou Guard in the north.

The reconnaissance result was that the Liaoxi Corridor was deserted.

However, the Haizhou Guard had thousands of slave soldiers stationed there.
Chapter completed!