After the field investigation just now, I found that the battlefield in the north is the most open, and Li Yuanhao's main force is stationed there, just now I also carried the "Wu" banner from there to try to break through, it is bound to be thought by the rebels, there is our preset breakthrough, although the first time did not succeed, but the second time is still located here, the logic is more reasonable, because the first time almost succeeded.

"But your map is not accurate enough," I pointed to the sketch, "I need to be as accurate as possible about the topographic map outside the North Gate, Bingbing, you can measure the distance, little slave, you can draw, you two go to the North Gate City Wall and draw me the map outside."

The two of them were ordered to go to the north gate, I checked the cannons, after the violent bumps of the rush just now, the structure of some cannons has been loosened, all of them are nuts and screws, etc., the engineers who came with the team are doing a "physical examination" of the cannons to ensure that they are in the best firing condition, I asked them, how long will it take to get it all right, the engineers said it will be good for a while, the wrench in their hands is obviously the latest under the guidance of Dai Lu, and the modern wrench is the same, but there is no nameplate and trademark.

I was about to check the shells again when Zheng Baobao rode over with a bird that looked like an eagle on his arm, but it was a little smaller, smaller than a pigeon.

"Is this your pet?" I asked with a smile.

Zheng Baobao was very serious: "This thing is an eagle pigeon, which was originally domesticated only by the royal family, but now that the war is needed, the eagle pigeon of the royal family is used to transmit information."

I'll just say that there must be some kind of way to quickly transmit information in the underworld.

The baby took out a note from the small aluminum tube on the eagle's pigeon's leg, unfolded it and looked at it: "Well, it's for you."

After speaking, Zheng Baobao handed me the note, I looked at it, and returned it, I couldn't understand it, I was too sloppy.

"What's written?" I asked.

"Your Majesty asked, when will you start and how are you going to fight?"

It turned out to be a letter from outside the city.

But I can't send the battle plan back to Lord Yama with an eagle pigeon, because no matter which way this gadget goes out of the city, it will be exposed to the noses of the rebels, and if there is a sharpshooter in the rebels, or a guy with good luck, shoot it down with one arrow, and my tactics will be finished!

It was even said that if this little thing could fly in, could it be that the rebels deliberately put it in - thinking of this, I suddenly had an idea!

"Baby, are you eagles and pigeons likely to be killed by the enemy?" I asked.

"Why is it possible? I'll be able to shoot it." Zheng Baobao said.

"Wouldn't it be very dangerous to use it to send a message?"

"You can release three of them at the same time, and one can fly out." Zheng Baobao said.

I nodded, and thought again, "This thing is precious, isn't it?"

"Okay, there are only about seventy of them in the city now."

That's a precious fart, not as many as artillery, and we only brought fifty guns.

"Lend me three, and I'm going to send a message to Your Majesty." I say.

Zheng Baobao dismounted and took out three small rolls of notes from his arms: "Okay, you say, I write, but I can only write twenty words."

"Enough, you write—what should you say in an hour?" I asked, I only knew that the underworld used an ancient timekeeping system, but I didn't know exactly how the time was calculated.

"Geng Shi." Baby Road.

"Then you write: When Geng, three cannons sounded as a trumpet, and the whole army at the south gate broke through, please answer." I crossed my fingers and counted the punctuation, exactly twenty words, and I couldn't waste resources.

"South Gate? Are you sure?" Zheng Baobao frowned and asked.

"No, North Gate, it's a trick."

"But ......"

"Leave it alone, listen to me." I laughed.

Zheng Baobao quickly copied the other two, and then handed them to a palace man carrying a cage in the back, who took out three eagle pigeons from the cage, rolled the note into the small aluminum tube of the eagle pigeon's claws, and went to the city.

I followed, and also went to the head of the city, I have not seen the pigeon operation in the yang realm, so I took the opportunity to see it.

The palace people released three eagle doves at the same time, these things, obviously well-trained, knew that there were enemy troops below, and flew directly into the sky, flying to a position of almost 100 meters, before starting to fly in the direction of Li Yuanhao's camp, moreover, the three eagle pigeons flew at different horizontal heights, but they were in a line longitudinally, so that if the enemy shot, the bottom one would cover the two above.