After greeting the team members, Fu Shouyuan quickly switched to a battery not far away and began to communicate with the new team members who coordinated the launch. Pen, fun, and www.biquge.info

The rapid-fire gun, which can fire seven shells per minute at the fastest and has a maximum range of 8,000 meters, has a high efficiency hit rate under the A-level perception control power that Fu Shouyuan is limited to a normal state by the air. In seven cannons per minute, a slightly deviated shot can kill at least two high-level enemy troops, and even the low-level enemy troops with bombardment are even doubled.

This time, Fu Shouyuan finally doesn't feel like he's playing soy sauce, of course, it's better if there is no state and time limit, especially the latter, which is only 140 guns in twenty minutes......

Naturally, there was consideration for giving a six-minute long-range shot and a twenty-minute rapid fire in the air, and during these twenty-six minutes, the enemy's almost constant micro-accelerated advance had reduced the remaining distance of six thousand meters to one thousand meters. Then, when the high-end is relatively more concentrated in the first two thousand meters, the rapid-fire cannon suitable for a slightly longer attack is no better than other short- and medium-range weapons to hit the high-level enemy.

"The goal is more scattered, sister's twenty-minute estimate, do you understand?"

The big boss is mighty and wise, please tell the next step.

"Let's play snipe, give you more shooting horizons than others."

Why not a spell kicker? Where can you consume more?

"It adds up to a lot, the bullets don't need to be controlled, and the spell is a type that has to be controlled remotely, so don't grind."

Gotta get it, the boss has the final say.

"Hmph, that's a must."

……

The circular 60,000-meter saw-saw zone is closer to the second major defense line, and the more extensive it is, the looser the firepower is distributed. By the last five thousand meters, it was no longer possible to completely connect the firepower into a tight net, and the various layers of positions began to be separated from few to many. The battle has changed from simply attacking and defending the front side to a situation where the edges of each position need to be intercepted left and right.

Since then, the range of melee capability clusters has been reduced first to the left and right, and then to the overall range, and when it reaches 2,000 meters, it has been completely discontinued.

Subsequently, the forts also canceled the stationing of personnel one after another.

At 19:17, the last kilometer of the tug-of-war zone was 606 square kilometers away, and all that remained was automatic fire, trap barricades, and unstoppable self-explosions.

At this point, the enemy's advance slowed down significantly, and the work on the construction of new automatic fire points on the second line of defense with a total circumference of 609,160 meters was officially stopped. The offensive and defensive areas are fixed as sixteen arcs separated by sections, with a total length of 556,360 meters, an average length of 69,545 meters, an average interval of 3,300 meters, and a total interval of 52,800 meters.

In contrast, the Maginot Line, the most famous modern warfare defense line on Earth, is 390 kilometers long, or 390,000 meters, and is slightly inferior to the second major line of defense.

However, the Maginot Line was the most famous for special reasons, and in fact it was only the fourth largest line of defense in Europe during World War II; The third largest line of defense in front of it, the Siegfried Line, with a total length of 630,000 meters, slightly exceeds the second major line of defense this time; The Stalinist Line, which was further ahead, doubled its length by 1.2 million meters; The number one Atlantic barrier with a length of 2.7 million meters! Not to mention comparable.

Of course, if you really want to compare, then it must be clearly recognized that the Siegfried Line was built from 1936 to 1939 when Nazi Germany was at its strongest; The Maginot Line was built by France in 1929 and was not basically completed until 1940; The other two lines of defense also took about ten years.

Strictly speaking, the construction of the three major defense lines will only take ten days to start large-scale construction, and a certain amount of space must be left for the evacuation of the people. In this way, the overall depth of the second line of defense plus the tug-of-war zone generally exceeds the average of these four. Although there is a difference between a high concentration of manpower and a leap in scientific and technological strength, it is really a breathtaking project!

It is not difficult to imagine that the initial investment resources for the construction of this defense line are huge, and the manpower required in wartime is also huge. Based on this practical difficulty, and taking into account the proportion of production and the subsequent long-term operational needs, the decision was made to set aside 16 sections of the interval area and cover it only with the firepower of the left and right of the defense line.

……

The one-kilometer automatic fire zone was quickly leveled by the enemy's advance at any cost. After confirming that there were no more of their own facilities in front of the defense line, the first wave of the second major defense line instantly destroyed the enemy in all directions, and microwave weapons took the lead in attacking.

Under the powerful electromagnetic pulse, the enemy army fell in pieces, and could not advance an inch. Only a handful of non-electronic artillery and ranged spells are still battling Earth's defenses, but they are of little use.

In this regard, the enemy's response strategy is very different from before, they do not introduce any electromagnetic pulse protection measures at all, and only rely on cannon fodder to push forward and consume. The reason is very simple, the battle line is too long, not only makes it difficult for the earth side to defend on all fronts, but also has limited means; It also makes it even more difficult for the Runeteres side to fully spread out the protective facilities and take them step by step.

As a result, microwave emissions continued until the energy supply was tight.

Then, all kinds of ultimates cooperated with the development of sub-regions, and the second wave of near-instantaneous total annihilation was barely achieved, and the all-round attack with a short duration was achieved.

The third wave, there is no need to think about it quickly, it is still the same sentence, the battle line is too long, it is opened this time, and it is a long-lost all-round bombardment of air and land firepower.

Unlike fighting in a tug-of-war, where you need to take care of your own facilities, the ground is now full of craters left by missile fire, and it is constantly changing shape. Soon, the second line of defense was covered with strangely shaped scarlets, accompanied by the remains of shells of various sizes.

After continuous new preparations, the overall firepower of the earth side far exceeded the enemy's shock force at the moment, and waves of saturated and indiscriminate bombardment gradually pushed back the enemy's footing range by a full 3,000 meters.

And in fact, the earth side is completely capable of pushing another two or three thousand meters, and the reason why it is only three thousand meters is to leave a lot of room for the enemy to send troops. In other words, is it to leave yourself more and wider room to strike, otherwise you will be waiting for ferocious firepower? That's a waste in disguise.

In the face of the earth side that is afraid of waste, the Runeterras side cannot effectively break through the defense force of the earth side even if it uses all the attack methods, which means that it is impossible to greatly reduce the defense facilities and attack power of the second major defense line in a short period of time. At the same time, the frequency of damage to one's own defensive circle has increased.

There is no choice but to prioritize the construction of a front-end defense system and wait for the opportunity to upgrade the offensive force. And this opportunity, I'm afraid it can't be waited for in three or two minutes.