When the wind rises, the thatch on the mountain castle after a summer of crazy growth is blown by the wind to form a green wave, and there are slightly yellow leaves sandwiched in the wind to fill the sky, and the autumn wind rises, and the seasons are unconsciously alternating .......

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After the whole army arrived at Kaichuan City, they set up camp in five miles outside the city, after a night's rest, at dawn the next day, Detian blew the horn, and at the same time the war drum beats, the Detian army is like a surging wave, and rushes to Kaichuan City. The German army divided its forces into three draws and took turns to attack the city.

Such a strong offensive did not make Kaichuan chaotic, Yu Chengzong sat very steadily, and used the most accurate and simple orders in scheduling to act according to the orders of the miscellaneous army that had not undergone strict assembly training, and it was also his ability to be a veteran, and it was precisely because of his imminent danger that the 110,000 soldiers were very obedient to him.

Yu Chengzong's five thousand Chinese cavalry is very strong and strong, he divided the five thousand Chinese cavalry into two teams, often in the opponent's siege when the change of troops, the two teams of men and horses are killed, specializing in the flank of the Detian offensive troops, breaking up the offensive formation of Detian, reducing the pressure on the city tower, and fast attack and retreat, well-trained, Yu Chengzong is like a cunning wolf, lifting the weight to deal with the attack of a group of young tigers, see the move.

In the shouting and killing of Zhentian, the whole day of attacking, when the curtain was low, finally looked tired, the people on the city tower were tired, the people under the city tower were also tired, the attacking force slowed down and weakened significantly, and the attacking Detian soldiers after a day of collision, lost thousands, but Kaichuan City was only a small loss, and the city was still impregnable, and did not suffer major losses.

The day's attack is over, the Detian side in the first day of the battle, there is no gain, the main generals are a little dull in the evening meeting, everyone is thinking hard about countermeasures, Kaichuan City must be captured quickly, not that they are too eager to advance, but they all understand a way, a blow, morale can not withstand a long toss, and the rear garrison is not strong, Kaichuan dragged their offensive footsteps, then it is equivalent to Wanli to win enough time, for Detian's trip, greatly disadvantaged.

"Dig a trench." Yi Wei said, "Let's do it now, dig until tomorrow, it should be about the same." ”

Everyone is a little curious, what is the use of digging trenches?

"Use several tents as cover, and dig an underground trench from the tent, so that it will not be discovered by the enemy, so that it can be different, and second, it will be protected from the attack from the ground, and third," Yi Wei smiled, "loosen its footing, and collapse its city." ”

"But the trick of digging tunnels has been used in Xuefeng Mountain City, and I'm not afraid that Wanli will be wary?"

"Don't be afraid, they can't prevent it, because the tunnel mouth will not extend into Kaichuan City." Yi Wei drew a tactical diagram on the white paper.

"The ditch is only under the gate, and here, in the area between us and the tower, the distance between the ditch and the tower from the ground must be at least twelve feet, so that the impact on the ground will not cause the ground to collapse, and the tunnel under the tower must be stretched upwards and close to the ground, but it will be enough to reach the footing of the tower, and we will hollow out it two-thirds ...... from the bottom."

"In this way, the city tower is not easy to collapse for a while, even if it collapses accidentally, because there is a certain hand arc at the end of the tunnel, and the tunnel is lower than the port, there is no need to worry about the retreat of the digging soldiers."

"It is estimated that it will take about two days to dig the tunnel, and when attacking the city the day after tomorrow, the troops should avoid the location of the tunnel, and even more so at the port of the tunnel under the city wall, we can use trebuchets to throw away from the distance, and the foundation is unstable, and the city wall should be very easy to loosen."

Although I don't know if this move will make the city wall really collapse as Yi Wei said, but you might as well give it a try, everyone discussed again, set up the direction of the tunnel, the angle and depth of the excavation, Si Yulin immediately ordered to go down, the Detian army took advantage of the night to carry out the fortifications for the second day of the attack, with the way of tasting the city overnight, the Detian army is convinced that any miracle can be created with the power of unity

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