Zhou Shanru was in the sixtieth year after the Sun Sect, and it was no different from what all the super-grade immortal sects expected, and the battle of immortals and demons officially broke out. This time, the first to attack was still the demons.

Also like previous attacks, the demons have never said it first and then done it, they have always done it and then said it, or even just did it without saying it.

This time, it was the demon clan that was unlucky. Like the previous fairy, demon and demon wars, the demon clan suffered because of its lazy nature and lack of too strong organization: the defense line controlled by the demon clan was penetrated by the demon clan at one time, and the demon clan lost an average of 1,400 miles, which is not counting, the key is that the demon clan lost the most territory, which is close to the side of the human race - if it weren't for the human reinforcements who set off in advance to help the demon clan hold the ninth line of defense, maybe this time the demon clan's defense line would have been broken through! However, even if the demon clan held the ninth line of defense with the support of the Terran reinforcements, but it was only more than three hundred miles away from the flank of the Terran defense line, once the demon clan guarded the demon clan with a small number of troops and turned the large army to the direction of the Terran, it was likely that the flank of the Terran defense line would be broken through by the demons, then the Terran troops in front of it might be outflanked by the demons from the flank and back, and the eight Terran defense lines in front of them would be in danger of being surrounded!

At this critical moment, the Terran Coalition Command entrusted the task of saving the Terran flank defense to the Sun Cult.

But the key problem is that the Terran first-class immortal gate is generally ten legions, and the Sun Sect is naturally no exception, so in the previous fairy, demon and demon wars, the Terran is on the defensive, and unless the offensive potential of the demon race is exhausted, the Terran will never choose to go out of the city to fight with the demon clan - compared to the physique and number of the demon race and the demon race, the human race is at a disadvantage! It's just that the human race is the best at using tools and brains to fight with the demons and demons, but this does not mean that the human race can also use weapons to defeat the demons or demons in the field.

Based on the calculation of 30,000 people in an Xianmen legion, in addition to the demon beast legion under the control of Zhou Shan, the Sun Sect has a total of 300,000 troops, if this force is in charge of a line of defense, there is still no problem, but to be responsible for the flanks of the eight lines of defense, but the heart is more than enough and the strength is insufficient, and the most troublesome thing is another thing, that is, the defense line of the human race and the demon race is connected, and between the two lines of defense of the human race and the demon race, there is no strong big city- This is also a way for the two clans to show their sincerity to each other, but this practice has brought trouble to the Sun Sect today!

In the middle of the sixty-second year of Zhou Shan's entry into the Sun Sect, the demon clan finally turned to the flank of the human defense line because he had been unable to attack in the direction of the ninth line of defense of the demon clan for a long time.

Originally, it was impossible for the Sun Sect to build a large enough city defense line in a year's time, but because of Zhou Shan, a traveler who had traveled through the fourth world, the Terran Race built the most famous defense mode in medieval Europe in modern society for the first time at the junction of the shemale defense line: the fortress!

Originally, the defense line established by the two demon clans was centered on the city, and a city wall defense system that stretched for thousands of miles was established, in order to fight against the demons, so the shortest of these city walls should be 100 zhang high, and the foundation of the city wall should be at least more than 80 zhang, and the top of the city wall was left with a combat width of 20 zhang, and there were bunkers and small bunkers on the top, which were used to arrange large weapons, such as bed crossbows powered by demon power or true qi mana. You must know that in large-scale battles, the power of blood and qi exuded by countless people and demons can limit the output of magic and demon power and true yuan mana, even if the cultivation of the Dao is high enough, it is inevitable that because of excessive consumption, the movement is too large, and then it will be taken away by the enemy's concentrated fire, so more often, the three warriors will choose close combat, which is no way to do it.

For the large-scale spells that the three parties can cast, such as earthquakes and other spells that specialize in destroying fortifications, everyone also has a way to defend, and the ultimate key is one point, that is, "it is easier to destroy than to build", after all, earthquakes are large-scale or even super-large spells, which require a long preparation time and enough accumulated strength, but these times are enough for the other party to find out and destroy the structure of the spell, and even if there is no time to destroy the spell structure of the earthquake, there can be other ways to intercept - All you need to do is subset in the direction of the earthquake spell or make a few ditches in a mess.

This is also a simple method discovered by the Terrans in another great war, because that time when the demons used the earthquake technique to destroy a wall of the Terrans, it did not have the expected effect, which made the demons attack the city very frustrated and suffered heavy losses. Afterwards, the winning Terran army was reviewed, and the failure of the Demon Earthquake Technique was also incomprehensible, and then it was a big man of the Immortal Gate who hid his identity, and when he walked in the countryside of the mortal dynasty, he saw a few naughty children playing, and then he returned to the sect to imitate the experiment, only to find that the original seismic technique relied on continuous vibration to the ground, so that this vibration was transmitted in one direction, causing the earth to fluctuate, so that the foundation of the building built on the ground was damaged, and finally collapsed.

However, the depth at which this artificial earth pulsation can penetrate into the ground is still relatively shallow, and if it is truncated in front of the conduction, or because of the diversion of ditches in different directions, then this artificial earth pulsation will lose its continuity, or change its direction, or divert, then it will make seismosis ineffective. The failure of the Demon Earthquake Technique was actually because the city wall was training recruits before the battle, and the immortal gate master who defended the city took a trouble-saving approach in order to avoid disturbing the environment in the city, that is, to let the recruits go outside the city to train the spells and tactics used in the group, and as a result, the terrain outside the city was inadvertently greatly damaged.

Therefore, if you build a well-equipped wall-type defense system, not to mention that 300,000 people go all out for a year, it is not bad that one million people can complete the city wall in a year, and the people who are still working are all Xianmen disciples who have made small achievements in cultivation, not to mention that the various heavy equipment required by the city wall system can be fully equipped in a year, you must know that now is the time when the Immortal Demon War has begun! Not to mention the Terran flank that the Sun Sect is responsible for, even if it is to supplement the front defense line of the Terran, it is still a little scrambling.

So, in the case of lack of people, materials, and time, a Supreme Elder who led the Sun Sect could only be a dead horse as a live horse doctor, and agreed to use Zhou Shan's suggestion- Since Zhou Shan returned to the Sun Sect, his status has improved like a rocket, although Zhou Shan only has the cultivation of the Yuan Infant (for people to see), but Zhou Shan has brought back nearly a thousand demon beasts in the God Transformation Period and the Tribulation Period, and this alone is enough to make the Supreme Elder of the Sect who can show up in the Tribulation Period praise it, not to mention the appreciation of the ancestor who founded the Sect- After 100,000 years, Zhou Shan has become the new disciple of the ancestor, and he is also a closed disciple, in terms of his generation, if it is not for the immortal sect not to teach apprentices, only to cultivate as the realm of success or failure, I am afraid that this session of the Sun Sect will have to call Zhou Shan the ancestor.

Since it wasn't a small talk, Elder Taishang, who didn't have any good ideas, immediately arranged for ten legions to be executed immediately.

Although the fortress is the pinnacle achievement of the fortifications in the era of cold weapons in Europe, the number of garrisons in the fortress is limited after all, and the demon clan and the demon clan fight with the same demon sea and demon sea tactics.

Between the fortress and the fortress, there is a distance of about a hundred miles, and the long-range equipment of the fortress will be covered in the middle of the fortress - this covered distance is not long, this is also a trap left for the attacking demon army, as long as the demons plan to avoid the long-range attack of the fortress, they must be attacked here by the fortress from both sides and the fortress from the rear or even bypass, this is a continuous and relatively hidden bloodletting mode, which is not easy to be recognized by the demons.

Each fortress is also composed of one large, six small and seven forts, and between the forts and the forts, there are trestle bridges in the air to ensure that the defenders of the six small forts can be supported by the troops of the main forts, and when they have to do so, they can also withdraw to the main forts. Of course, if you want to break through a main fortress, the demons don't need to spend ten times the number of deaths of the defenders of the fortress, and for up to a month or two, don't want to break through it - unless the demons send all the masters above the god transformation stage to crush it! Otherwise, if one fortress is broken, there is the next one, with the number of fortresses designed by Zhou Shan, it will not take three or two years for the demons not to want to penetrate the flanks of the Terrans-and at that time, the Terrans have already sent more reinforcements, or simply built new fortifications behind the broken battle line.

Calculated with the depth of a human race and demon defense line, eight times that of two hundred li, is one thousand six hundred li, and with a fortress controlling a distance of fifty miles, a defense line needs to be arranged with thirty-two fortresses, of course, this kind of fortress is not the kind of large fortress fortress - the fortress in European history that can really fight, the number of warriors that can accommodate is not much, often only one or two hundred warriors, can hold out for a long time.

Although the world of Xianmen is different from the Middle Ages in modern society, the warriors that a fortress can accommodate are only about a thousand soldiers, which is still an arrangement made considering that each fortress has six small protruding fortresses, so don't look at the distance of 1,600 miles, in fact, only a total of thirty fortresses are needed to form the first defense system, and ten legions can be arranged into ten lines of defense- If he really did this, the Taishang Elder as the commander would be an idiot, after all, the pure defense of the city could not be defended, and while guarding the fortifications of the Imperial Fortress, what the Xianmen had to do must also include continuous counterattacks! And the counterattack was handed over to Zhou Shan's Demon Beast Legion and the one of the ten legions that rotated at any time.