Nurhaci knew his son was worried about his safety. Just as he was about to refuse, Degelei glared at the guards beside him and shouted, "You blind slaves, why don't you protect the Khan quickly?"

Tong Yangxing also stepped forward at the right time and advised: "Khan, it will take some time to fill the trenches. Pulling the troops back and waiting will not affect the attack."

Nurhaci pondered for a moment and decided that this was the best approach. It would neither appear cowardly nor cause the troops to suffer further casualties in the bombardment.

With one order, the attacking troops were to retreat five miles as if granted amnesty. According to estimates, this should be a relatively safe distance.

The red cannons on the city walls stopped firing, which made the Jiannu think that retreating was a good idea. However, they did not know for sure that the red cannons had a very slow firing rate, which was a common problem of muzzle-loading cannons at that time.

First of all, the Red Cannon is a recoil-type cannon. Every time it is fired, it will deviate seriously from the original firing position and needs to go through the steps of resetting, reloading, and resetting the direction and elevation angles.

Secondly, after the artillery is reset, a wet brush should be inserted into the barrel to clean and extinguish sparks, and then a gun barrel wrapped in dry cloth should be inserted into the barrel to wipe it dry before filling it with gunpowder and placing the shells. It may also be necessary to stuff something in to secure it.

It can be seen how complicated the firing procedure of a muzzle-loading artillery is. Being able to fire one round every two minutes is a very good speed.

But the Red Cannon stopped bombarding, while the other cannons on the city walls continued to roar, destroying the Jiannu's shield chariot formation.

You know, the fortifications outside the city were not built casually, but the distance was determined by combining the power of the range of various firepower.

The first trench was about 400 meters away from the city wall, within the range of the Portuguese and general cannons on the top of the city.

These cannons are not as powerful as the Red Cannons, but there are many of them and they are more than enough to deal with shield carts.

In the eyes of the Jiannu people in the distance, flames on the top of the city kept flashing, white smoke rose, and solid shells flew through the air at a speed visible to the naked eye.

There were so many artillery pieces! A chill ran down the Jiannu soldiers' hearts, including the officers. While heavy armor could withstand musketry, artillery was no match for it.