Nanye immediately looked at the big screen and saw a piece of artillery falling on two huge tortoise shell giant shields. The two huge tortoise shell giant shields seemed to have cracks.

"Zoom in and make it clear!" Nanye shouted.

"Sir, the camera has been pulled to the limit!" The intelligence officer reluctantly said that in order to ensure the survival rate of unmanned reconnaissance aircraft, all UAVs responsible for investigation fly at the highest ceiling altitude. At this altitude, it is difficult to take a particularly clear picture, and the resolution can not be reached at all.

"Reduce the flying altitude of a UAV. I want the clearest picture!"

Nanye said in a deep voice that soon, a black coated unmanned reconnaissance aircraft began to reduce its height silently. With the continuous reduction of the height of the unmanned reconnaissance aircraft, the picture of the large screen gradually became clearer and clearer, and everyone in the command center saw a shocking scene.

"There are cracks on the tortoise shell!"

Some people exclaimed in disbelief that the high explosive shells failed to crack the huge tortoise shield, but everyone in the command center clearly saw that the two giant tortoise shields were full of special warheads, which were deeply embedded in the tortoise shell.

There are cracks everywhere at the edge of the warhead, and many tortoise shells even show signs of being pierced.

"It's a tungsten armor piercing bullet!" Nanye's face changed slightly and he immediately recognized the dense warheads. This is the 155mm tungsten alloy armor piercing bullet of Qinghu fortress. This artillery shell can pierce a 100mm homogeneous steel plate in the front. As long as two or three armor piercing bullets hit the same position, they can pierce the tortoise shell giant shield.

"Sir, according to the ballistic calculation, it's an armor piercing projectile launched by A17 defense zone!" The intelligence officer operated several times on the computer and immediately shouted.

“A17? That is the defense area of Li Mu and Zhao Xin! " Nanye remembered the list as soon as he thought about it. Obviously, the order to replace artillery shells should be issued by Li Mu. Although Zhao Xin is the son of a senior general, Nanye doesn't despise him. He doesn't have the ability to think of it at all.

"Order all artillery units to replace armor piercing shells and continue shelling with armor piercing shells!" Nanye ordered without hesitation. Unexpectedly, Li Mu is not only strong, but also has such a keen sense of war. He is definitely a good seedling. If he can be officially recruited into the alliance military, he will certainly become an independent top general in the future.

But all this will wait until after the war.

"Yes, sir!"

"Come on, come on, the Artillery Force will replace armor piercing shells, and all armor piercing shells will be replaced!"

As soon as the order was issued, all artillery units of the whole Qinghu fortress facing the direction of the water demon army immediately began to replace armor piercing shells and directly use armor piercing shells for shelling.

"Li Mu, do you want them to replace armor piercing bullets? But I heard that the killing effect of armor piercing bullets on monsters is very general, far less than high explosive warheads! " Nangong Mingyue said curiously.

"Bright moon, don't pay attention to this fool. You command indiscriminately in wartime. This boy is going to the military court!" Zhao Xin didn't know when to follow him and said disdainfully.

Li Mu glanced at him and smiled faintly.

"You know shit!"

Since the boy is full of hostility and killing opportunities, Li Mu also needs to save face for him. Even if he is the son of a senior general, Li Mu still doesn't pay attention to him.

"What are you talking about?" The cold light in Zhao Xin's eyes flashed, and he suddenly became angry.

"Boy, apologize to childe Zhao!" Luo Jiu also looked gloomy and had a great momentum. He directly shouted to Li Mu.

"What are you doing, Zhao Xin? Don't go too far!" Nangong Mingyue's face sank, and she shouted discontentedly. She stood in front of Li Mu all her life and directly faced Luo Jiu's momentum. Fang Hong, the four King Kong of Nangong family, had no choice but to come forward and protect her.

Zhao Xin saw Nangong Mingyue stand out for Li Mu, and a blood color flashed in his eyes. His heart was full of anger.

"Sir, according to the command center, all artillery units have changed armour piercing shells!" Just then, the artillery commander of this section of the city wall suddenly shouted.

His words made Zhao Xin and others look puzzled. The killing effect of armor piercing bullets on monsters was obviously not as good as high explosive bombs. How could the command center make such a mistake?

"Hum, it's impossible. How could Nanye give such an order? How could he make such a stupid mistake!" Zhao Xin said with an ugly face.

"You'd better ask him yourself if you're so free!" Li Mu sneered and didn't bother to talk nonsense to him again. He immediately paid attention to the picture sent back by the main brain.

Nanye ordered that more than 20000 heavy guns at Qinghu fortress be replaced with armor piercing shells. The dense armor piercing shells began to pour wildly. There were only ten armor piercing shells for each heavy gun. Nanye didn't intend to leave these armor piercing shells at all. The black armor piercing shell rain directly fell on the turtle shields.

"When, when, when, when, when!"

Numerous armor piercing shells directly hit the tortoise shell giant shield, and a dull impact sounded madly, but in the twinkling of an eye, those tortoise shell giant shields were full of tungsten alloy warheads.

But this is just the beginning. More than 20000 heavy guns continue to fire, and half of the armor piercing shells directly fall on the tortoise shells. In one round of salvo, more than 10000 tungsten alloy armor piercing shells fall on these tortoise shell giant shields. After ten rounds of salvo, all armor piercing shells are fired, and more than 100000 tungsten alloy armor piercing shells are full of those tortoise shell giant shields.

"It's not enough. Apply to the command center to transfer armor piercing shells from other places!" After ten rounds of volley, Li Mu shouted to the artillery commander without hesitation.

The artillery commander didn't know what Li Mu wanted to do, but from the reaction of the command center, Li Mu's decision seemed to be right, so he didn't hesitate to apply directly to the command center.

The artillery troops on the city wall didn't know the significance of using armor piercing bullets, because those water demons were still dozens of kilometers away from Qinghu fortress. They couldn't see what was happening so far.

"Get all the armor piercing bullets together, come on!" Nanye received the application and saw the dense tungsten alloy warheads on the tortoise shell giant shield. He chose to believe Li Mu's judgment and immediately mobilized armor piercing shells from other places without hesitation.

There are 100000 heavy guns in the defense line of the wall of Qinghu fortress, and other heavy guns are also equipped with armor piercing shells. Boxes of armor piercing shells are quickly pulled up by military vehicles and pulled through the roads inside the wall.

"Keep firing!"

Then the artillery that had just cooled down for a while began to roar again, and one round of artillery salvo lasted nearly half an hour.

When the armor piercing bullets stopped falling, at least two or three thousand tungsten alloy warheads appeared on each turtle shield. Some warheads even overlapped together, almost penetrating the turtle shield.

The water demon army did not stop for half an hour and continued to approach the green lake fortress.

"Change the height of the bomb!"

Li Mu looked at the picture in his mind and continued to command. The command center has been following Li Mu's command. The defense area of his city wall has just changed high explosive bombs, and the other 20000 guns have also changed high explosive bombs at the same time.

"Fire!"

"Boom, boom, boom!"

The deafening gunfire appeared again, and heavy artillery shells roared out. Dozens of seconds later, these high explosive warheads began to fall.

Numerous high explosive bombs fell directly on those tortoise shell giant shields, but after a round of volley, these giant shields still had no response.

"No effect?" When the command center was quiet, the armor piercing bullet was replaced, and the killing efficiency against the water demon plummeted again. Is this the result of the armor piercing bullet attack that lasted for half an hour?

"Keep firing!"

Nanye was expressionless and continued to order fire.

More than 20000 guns continued to roar, and high explosive bombs converged into dense raindrops.

"I thought you had some tricks in your pocket. I didn't expect to change to high explosive bombs in the end!" In the defense area of the city wall, Zhao Xin said sarcastically.

The nearly 100 supreme masters who were assigned also looked at Li Mu one by one. Many people also felt that Li Mu was giving arbitrary command. Changing armor piercing bullets was meaningless. It also delayed the artillery troops from attacking the water demon, which would make Qinghu fortress bear more pressure later.

The roaring gunfire continued to sound, and high explosive warheads continued to fall directly on the huge tortoise shield. Just when everyone in the command center thought that the strategy just adopted had no effect, a huge tortoise shield with a diameter of more than 200 meters crashed.

"Boom!"

The tortoise shell giant shield crashed directly in the center of the huge screen, followed by the second, third and fourth sides. In the twinkling of an eye, all the tortoise shell giant shields that had just been suspended in mid air were broken and fell, and there was no obstruction in front of the shells.

Dense high explosive bombs fell again, harvesting the lives of water demons.

"Burst!"

There were excited cheers in the command center. They bombed heavily with armor piercing shells to destroy the tortoise shell structure, and then bombarded with high explosive shells to destroy the tortoise shell giant shield from the inside and outside. This operation plan is too thoughtful. If it is not such an operation plan, it is afraid that the water demon will come to the foot of Qinghu fortress, and these tortoise shell giant shields have not been destroyed.

"OK, continue shooting and kill the effective power of the water demon as much as possible!" Nanye general's face also showed a smile and said in a deep voice.

However, a doubt flashed in Nanye's heart. How did Li Mu know the situation of the water demon army? Did Li Mu have special means to see those tortoise shells and giant shields?

"Sir, the command center said that the combat goal has been achieved and the goal has been destroyed!"

The artillery commander of this section of the city wall defense area received the notice and said to Li Mu with an excited face. Although he didn't know what the combat purpose was, the command center was obviously very excited.

"What is the purpose of the operation? What are you talking about? " Zhao Xin looked discontented and felt that there was a secret hiding from him. Unfortunately, Li Mugen didn't pay attention to him.

The war has just begun.