Tower Defense Strategy

In the first half of XX26, affected by the export and transportation of raw materials at the source of goods, the world's two major industrial centers gradually became unable to do so.

　　 Faced with the increase in the number of surviving monsters, there is no longer the ability to completely eliminate them.

In the second half of the year, the nests built by the monsters have undergone certain development, and the first-level monsters have appeared in groups. Except for a few areas with sufficiently strong armed forces, most of the world has lost satellite communication capabilities, and the survivors have retrospectively used radio requests. External airdrop material assistance.

　　 The real countdown stage that surface civilization has entered.

　　 In XX27, the world island could not be held either. West Central Continent was partly occupied, the Central part was occupied, the Arctic Circle was partly occupied, the Southern Peninsula was mostly occupied, and the southeast Peninsula was partly occupied.

　　 The beautiful continent is also difficult. Because of the strategic relationship, the territory of Country A has been screened by little monsters, and it is basically the spontaneous armed response of the people. It seems to save defense expenses, but this kind of penetration also completely destroyed its production system this year.

　　 In the movie, the fact that one person saved the world did not happen. After the production system was partially destroyed, the strategic inventory was quickly consumed. Country A had to shrink the battle circle, and the southern beautiful continent had to give up.

　　 In XX28, a country sent special forces to rescue yellow cakes in the occupied areas (the state after the initial processing of the uranium ore, the radiation dose is very low, and workers do not need to do professional radiation protection).

During the operation that lasted for several months, on average, for every 10 tons of yellow cake to be rescued, one helicopter, two soldiers were lost, and one strategic transport plane deployed at the temporary airport was lost for every 100 tons, and four more were lost in the entire battle. Frigate.

　　 Today, when supplies are scarce, even if such a loss is distressed, it can only be done forcibly, because uranium has become one of the few possibilities for future surface people to wait for astronauts to support.

　　 At the end of XX29, the leader of Country A gave a speech and the federation was disintegrated.

　　 Within a few days, several countries that are still alive and still able to use satellites also gave speeches, basically the same, thanking each other for not using nuclear weapons to destroy each other in the world.

　　At this time, I have to say that although countries have different positions and some countries do not pay attention to how to do things, at least the people in charge in the last few years have kept the bottom line and dignity of mankind.

　　 The event was recorded by the astronauts as a major node in the monster crisis.

　　 Since then, those who are still alive can only use the city as the last fortress and continue to fight against the monsters.

　　 The progress of country C is a bit slower. After all, the wreckage of country J is blocking the ocean. Except for the green mist monsters, there is more time to prepare for battle against ordinary monsters.

　　 But with the global collapse, the product-exporting industrial centers also collapsed.

　　 From the time when Country A disintegrated, Country C began to comprehensively promote the urban defense circle plan that had been laid out in the early years.

　　 Relying on the existing large cities and main resource-producing areas, a total of fifteen urban defense circles will be built within the territory. These circles can be large and small, and the large can cover thousands of square kilometers.

It includes several defensive circles that have spent a lot of money to coordinate overseas. It is hoped that even after the frontal combat capability is completely lost, the supply chain including coal, iron, aluminum, yellow cake, and oil can still be maintained. However, this supply chain is only There is not much capacity to speak of, because it mainly relies on air transportation.

　　 In XX32, country C also lived in Bengbu. They didn't just stop doing it. Instead, they announced a few months in advance that they were about to lose their ability to face the battle, giving the people enough time to transfer.

　　 More than a decade passed in the blink of an eye.

　　 In XX45, the central defense zone of Dajiang launched a supply rocket into space.

　　 The number of this rocket was also written in historical records by astronauts. It was the last material rocket sent from the surface to space. Since then, only sporadic communications and reconnaissance satellites have been launched.

　　City defense circle may be a good idea to fight monsters.

　　Monsters have the concept of territory. They do not have unlimited global raids. After destroying a certain area and no threat is felt, the monsters will be stationed.

　　 Based on the land area of ​​the earth ball, even if there are thousands of monsters of level one to three, there will always be some lucky cities that have no defense at all, and have not been attacked by monsters at all.

　　Of course, there are no monsters, but little monsters are uncommon. They have smaller territories and will group into groups from time to time, and tend to spread the world like humans.

　　 After being transformed into an urban defense circle, the last urban defense area was not destroyed until XX71 by the wandering level three monsters.

　　At this point in time, the astronauts actually had a way to repel the level three monsters.

　　 After weighing, the command team believes that exhausting ammunition reserves cannot change the trend, and should shift more manpower and material resources to production.

　　 The space commander at this time is the same generation as Xihe, and is no longer the first generation of space immigrants. It is not surprising that such a decision is made.

　　 The destruction of the last city defense zone does not mean that all people on the surface are destroyed.

　　 Analyzing the intelligence collected by the space station and intelligence satellites managed by the astronauts, it is estimated that at least one billion people are still alive on the surface and underground.

　　 But compared with the city defense circle, the people who are still alive are weaker and smaller.

　　 The city defense circle promoted by country C is a complex that includes self-sufficient power generation, independent production, and can confront first-level and even some second-level monsters.

　　 Without this system, there are only a few giant underground refuges with a certain anti-monster ability, and the others are basically no protection.

　　 After decades of survival and fighting, people who are still on the surface have generally switched to using black powder and ammunition.

　　 Judging from the history of weapons development, nitrocellulose gunpowder was followed by black gunpowder. Before the monster crisis, black gold was mainly used. This is a chemical product that belongs to the synthetic ammonia industry.

At this time, humans can’t synthesize ammonia, and cotton can’t be grown in batches. They can only steal some from under the monster’s eyelids while harvesting. As for the production of nitrocellulose... the technical difficulty is a bit high, only a few. Talents have raw material extraction technology and safe production capabilities.

　　 The threat of black gunpowder weapons to the little monsters is extremely limited. It can only be said that it is better than empty hands. This is probably the last struggle of mankind.

　　 The number of people on the surface has decreased a little, and the astronauts decided to change the calendar during this period.

　　 is based on the date of Xihe's birth, and still uses the earth ball revolution time, changed to the solar calendar...actually, it is the same as the Gregorian calendar, but it is called a different name.

　　 They did not decide to change the calendar for no reason, but in the 50th year of the solar calendar, the Red Star immigration base completed full self-sufficiency, which means that human beings have finally gotten rid of the **** of the parent planet.

　　 The last surface people are being tortured by monsters and become more and more primitives. When the astronauts have entered a period of great development.

　　 In 75 years of the solar calendar, the number of astronauts (excluding red stars) returned to the number before the death of the first space migrants.

　　 80 years of the solar calendar, the first aircraft to use a tokamak fusion device to complete the journey from the moon to the orbit of the red star in a powered-on state.

　　 In 105 years of the solar calendar, the population of Red Star exceeded 10,000, and a large proportion of infants and young children were reduced to 15 years old, almost entirely dependent on fully automated production equipment to maintain.

In 105 years of the solar calendar, the Jupiter satellite II and the Europa ice layer were opened, which proved the distant conjecture. Under the glacier of this satellite, there is a liquid ocean maintained by the internal energy generated by Jupiter’s gravitational pull for a long time. It is liquid water, which can separate certain mineral resources, which needs to be further explored.

　　 The solar calendar is 130 years old. Astronauts believe that in the next few decades, space production and transportation capacity can bear a certain loss, and they decided to start the "home star recapture plan."

　　 The so-called planning is divided into several stages, but only the third stage, orbital deployment, took nearly two decades.

　　 241 years in the solar calendar.

　　 Earth ball, the surface.

　　 Refuge name: Song Emperor Palace, communication number CJ008.

　　 The name of Emperor Song Palace is no longer remembered. Since the grandfather's generation's base collapsed, the base has been divided into two parts.

　　 Xiao Shitou will lead his teammates to go out to grab wild crops. I don’t know if they will die.

The name 　　 little stone, with the blessings of the elders, I hope not to be attacked by monsters when going out, and the names of other people are similar.

　　 Their equipment is amazing. They are wearing dark green camouflage chemical fiber jumpsuits. They have animal skin belts at their waists, with animal skin pockets hung on them, and electromagnetic rifles in their hands.

　　 The team members just assembled, opened the gate and prepared to cross the long underground ramp.

　　 Suddenly a radio that hasn't been heard in decades sounded.

"Song Imperial Palace, this is the Future. According to Resolution 241A of the Solar System Resources Management Department, we are about to rely on your base to implement the home star recapture plan. The pioneer troops will land on your base's Wulimen in 20 minutes. 'Outside the station."

"repeat…"

　　 "???"

　　 "What do you mean?"

I understand the words 　　, and I don’t know what they mean when they are together.

　　 All of them looked at the little stone.

　　 Xiao Shitou recalled what he just heard. Regardless of the front, the important information that can be understood is outside Wulimen Station in twenty minutes.

　　 Wulimen... Xiao Shishi recalled, suddenly looked at a team member: "Stump, get your kettle."

　　 "What are you doing?" The stump used a rifle to cover the kettle. It was useless, but was pulled out from the side by a small stone.

　　 This is a homemade kettle, very rough, almost like a can.

　　 did not tear off the strap, pointed to a few vaguely stamped words on it and asked: "Is this Wulimen?"

　　 can see the only three characters "┱┍ door".

　　 Everyone can't see clearly, two of them don't even read much.

　　 "The stump of this thing was picked up near the third gate. Let's go there and it won't be long."

　　Okay, just do that.

　　 The six-man squad was fully armed and set off.

　　 They don't recognize the place now, mainly because the tools and people that can make maps are on the other side before the collapse. After generations, the hand-painted maps have been worn out by many rounds, and there are no such complicated marks.

　　 Wulimen is a subway station. Of course, two hundred years later, even if it is not a subway station, it is just a man-made cave, and there have been some cave-ins.

　　 Since it is a subway station, there must be a lot of signs with the word Wulimen, metal ones have long been reused by people, and there are plastic signs, plastic bags, packaging boxes and the like.

　　 The six-person team usually organizes some things that seem useless, and seem to be used somewhere, are concentrated in the entrance and exit, and maybe they will be treated as obstacles by the monsters and will not enter.

　　 found this pile of things, lit a torch and searched for it for a while, and there were these words as expected.

　　 After doing this for a while, the time was almost delayed, and a few people cautiously touched outside the station.

　　 hadn't gone out yet, suddenly heard a few loud noises outside, and several of them hid for a few minutes to listen to the movement.

　　 Then, a quadruped robot with a square head and a square brain appeared in front of them.

　　 The robot was blown up, and it was not completely broken, and began to talk.

　　 "Don't be nervous, we know that there are still living people in the Song Emperor's Palace. The people who came to help you are already outside. Please don't shoot again. It will cause very serious consequences."

　　 A few people looked at each other. UU reading www.uukanshu.com was still the little boss, Xiao Shiu, who was more courageous. He threw the gun behind him and hung it, pulled down the sun protection glasses, and walked out.

　　 It's quiet outside, just a few things.

　　 An object that is not known whether it is a human being is more than two meters tall. There are two legendary robots beside this thing, with two legs bent backwards, with a big gun in his hand pointing diagonally to the ground.

　　 Except for these, there are three big iron cans behind them, because they are blocked by weeds, so they don’t know how they stand on the ground.

　　 The two sides were quiet for a while, and the humanoid object raised his hand and took off the helmet.

　　...It's human.

　　 Although meeting people is not necessarily a good thing, it is better than meeting monsters.

　　 "Surface people, hello, my name is octopus, now I will bring you back all that you have lost."

　　…………

　　 Three thousand six hundred years later, in a space station orbiting the star outside the huge star of Orion, a bald octopus...the projection of Wang Yitai is standing by the porthole, looking at the filtered giant red star Betelgeuse.

After 　　 became an observer of the Great Galaxy Advanced Intelligent Life Consortium, he learned about the games he played in the past by reading encrypted data, turning himself into a part of history.

　　Why was the technology he provided to ancient people "invented" at the right time? Because someone is doing "historical correction"?

　　 Because he participated in history, he is today?

　　 Some paradoxes have been solved with the development of the times, some have always existed, and will exist forever.