"There are too many of them!" A soldier quickly took down the M-240 general-purpose machine gun that had been emptied of bullets, opened the upper cover of the machine gun, and quickly reloaded the new bullet chain quickly, and the M-240 general-purpose machine gun with the reloaded bullet chain was set back, aiming at the mutated islands outside to start shooting.

"No, kill a group and come again!" A soldier watched him just use the M-4 recoilless gun to fire an airburst bomb, which directly reimbursed a group of them, and at least hundreds of mutant birds were directly blown into pieces and fell, but the soldiers were not optimistic, because they saw a large number of mutant birds and filled the vacant positions again, which made their faces very ugly.

"Boom! Boom! Boom! Boom! Compared with other soldiers, it is inevitable that they will be affected by their own emotions, but for the completely mechanically controlled sentry cannon, there is no emotion, the double-barreled 40mm cannon is constantly spraying flames, and a 40mm high-explosive shell continues to explode in the sky, and a large number of shrapnel quickly pierces these mutant birds, of course, those mutated birds will not just watch their own kind of sentry guns as rabbits to fight.

A large number of mutant birds rushed directly to the Sentinel Cannon, and they directly attacked the Sentinel Cannon without their claws and mouths, but they obviously overestimated their attack power, and their attack hit the Sentinel Cannon, which didn't even leave a white spot, but the Sentinel Cannon could easily kill them, and it was very easy.

"Machine gun fortress all free attack!" Li Cheng gave an order, and the mechanical fortress, which was originally calm and without any movement, directly began to spray large-caliber bullets, but due to the influence of the angle, the machine gun fortress could not attack the mutated birds in the sky at will, and could only hit some targets at fixed angles.

"No, how many resource points do you need for anti-aircraft guns!" Li Cheng looked at the mutated birds that kept rushing over, Li Cheng felt that the air defense force in the base was still too weak, and the sentry guns could shoot at the air, but they themselves were not designed for the air, in essence, they also belonged to the ground-to-ground automatic turret, and the anti-air was only an advantage that they brought over, so the essence of his fire control system was ground fire control.

"The Red Alert space anti-aircraft cannon needs 4,000 resources, and these anti-aircraft guns are all double-barreled guns composed of 76 mm guns, which can be used not only for air control, but also for the ground, and at the same time their double-barreled 76 mm guns, anti-air firing can shoot at targets with a flight speed of no more than Mach 2 speeds, and the anti-air firing altitude is 6,000 meters, and the ground firing distance can reach five kilometers, and 10,000 shells can be refreshed every day." Red Alert Space said to Li Cheng that the Red Alert Space Air Defense Cannon is indeed at stake, because these Air Raid Guns are specifically aimed at the current fighter planes, and they can basically target those fighters who dare to fly into this attack distance to drop bombs and do not know whether they are alive or dead.

"Yes, there is still no money!" Li Cheng looked at the anti-aircraft cannon in the red alert space, it was strong enough, but there was no money, and there was no way to build without money.

"Oh no, there are traces of virus organisms found outside!" A soldier was loading an 84mm shell into the M-4 recoilless gun, and when he accidentally glanced at it, he noticed a large snake head slowly retreating, unlike the other snakes, his skin was purple in color, unlike the green snakes he had before.

"Looks like we're in trouble!" Li Cheng also glanced outside, he didn't find this purple giant snake, but found a large number of mutant rats quickly rushed out, but now there are no soldiers on the wall, and those mechanical fortresses can't hold on.

"Engineer, show me your secret weapon, and open the eyes of this commander!" Li Cheng didn't have much to worry about, because just a week ago, the engineers of the Red Guard had already renovated all the walls outside the base, and as for what the transformation looked like, these engineers just said, when a strong enemy is coming, you will know, commander.

"Open!" Originally on the wall, which was still flat, there were suddenly rows of shooting holes, and one by one the barrels of black holes were released from the inside, aiming at the mutant rats who were charging outside, and they started shooting directly, which made Li Cheng even more unexpected, but there was no soldier inside, it seemed that the engineers had installed something like an automatic firing device inside.

"This wall renovation means that only the upper part can be modified, and the lower part of the stressed body cannot be transformed, so as to prevent affecting the solidity of the wall!" An engineer watched as he worked hard to rebuild the fence as he continued to kill the mutated rats, but they added a fire control system to give the guns some self-aiming and firing capabilities.

"Sure enough, war still makes people the most progressive!" Li Cheng sighed, there is nothing that can force mankind to make the fastest progress is war, because war has no morality to say, there is only one result, kill the other party, or kill the other party, there is no third result, either victory or death, it is so simple and miserable, the winner lives, the loser dies, and countless historical battlefields have been constantly eliminating countries and human beings in inappropriate times.

"It seems that the other party is not trying to break us, but wants to hold us back!" Li Cheng suddenly found a problem, the attack intensity of those virus creatures seemed to be very stakes, but Li Cheng saw other mutant creatures or virus creatures, and did not plan to attack, but calmly watched those mutant rats come over to die, as well as the birds in the sky continued to attack, and they did not have the slightest intention of cooperating.

"Engineer, can you reload that thing?" Li Cheng looked at the flames that were still spraying, and shooting at this speed, it wouldn't take more than an hour, and the self-firing guns in the wall should be without bullets.

"Don't worry, Commander! There's a special passage and space for reloading bullets, and I've let the conscripts go in and watch them, and they'll reload them as long as the bullets are running out! The engineer said that Li Cheng could rest assured that they had already thought about this problem.

"Notify us, the other party is likely to want to drag us and don't want us to go out, immediately ask Xiao Chenqing to contact other nearby safe zones to see if the virus creatures are besieging that safe zone again!" Li Cheng asked a soldier to go down to find Xiao Chenqing, and asked Xiao Chenqing to ask if there was another security zone to besiege, and the other party obviously wanted to interfere with them.