Compared with Xiao, who has been making money and making a lot of money recently, Li Shimin is obviously a little depressed, Goguryeo is not easy to fight, this is a problem that has been verified in the pre-Sui period, his statement at the Chang'an oath meeting, just for those Goguryeo people who moved to Chang'an to see, the real army came here, he knew how tenacious the Goguryeo people were against the Tang Dynasty, and almost did not give him a chance to show his hand and benevolent side.

"Your Majesty, let the soldiers climb the wall and kill them! With catapults and ballistas alone, our armaments are depleted too quickly. ”

Su Dingfang, who was deeply aware of the cost of those arrows, had to speak out after more than 2,000 chariots were projected continuously for more than an hour.

At this hour, more than 100,000 arrows and tens of thousands of stone bullets were shot, and the cost of fine iron arrows and stone bullets alone reached tens of thousands, and this was only the third city attacked after Li Shimin's army arrived.

The lethality of the new equipment, as soon as it entered the battlefield, really played its due effect, and it only took half an hour to break through a fortress that Su Dingfang had attacked many times before, but did not knock down, and this momentum made the morale of the Tang army very high.

However, when it came to the second fortress, there were very few pictures of the destruction of the enemy army, and the Goguryeo people began to think of various ways to resist the rain of arrows and stone bullets in the sky, and this fortress was fought for more than an hour, and after about half an hour of white-knuckle fighting, it was taken.

When it came to the third fortress, the effect was even less obvious, such a large-scale arrow, stone bombardment, there were only scattered screams from behind the city wall, and when the Tang army wanted to climb the wall to the city, those Goguryeo people would rush out and attack the Tang army's iron armor with heavy weapons, bringing a lot of damage to the Tang army's attack.

War makes mankind progress, this sentence is not false at all, Goguryeo against the Sui Dynasty army of those generals are still there, they know how to grope for various ways to resist the enemy on the battlefield, which will make the Tang army on the attacking side of the equipment advantage, smaller and smaller.

"Goguryeo has built a lot of walled cities in all directions, and it is not worth filling them with the lives of soldiers. These weapons and equipment, what we have is that Sun Zhengming will let people send them from the rear in a steady stream, so don't feel sorry for the equipment, just ensure that there are fewer dead, anyway, every time the city is broken, can't we still take back more than half of it to continue to use it. ”

Li Shimin's words made Su Dingfang a little speechless, when he looked at Li Jing, he found that he had been holding a telescope looking at the battlefield in front of him, looking thoughtful, now, the Goguryeo people are bent on holding on, waiting for the arrival of the coalition army that exterminated Gaode, and the strategy is useless to them.

"Your Majesty, just throwing bombs and projectiles, it is no longer possible to cause effective damage to the Goguryeo soldiers defending the city, our army's iron armor and heavy shields, which can completely defend against the gravel fired by catapults, as long as you can ensure the landing point of the stone bullets and do not smash them on the head of our army, you can all throw stones and arrows while marching, as long as the enemy troops hiding in the tunnel bunkers in the city do not come out, they can block their exits, you can catch turtles in the urn and capture them alive in one fell swoop."

"Throwing stones and marching at the same time?"

Li Jing's sudden suggestion made Li Shimin a little stunned.

However, when Su Dingfang heard this, he was overjoyed, and said, "Your Majesty, as long as you calculate the elevation angle and landing point, this offensive method that Li Xiang said can be completely done." ”

Li Shimin was stunned again, "Calculate the elevation angle and landing point?" ”

"Your Majesty, the materials used in the manufacture of these chariots in Shanyang are very standard, and the elevation angle and the weight of the stone bullet can also be standard, so as long as the lieutenant in charge of the calculation calculates the elevation angle and landing point, and maintains the formation advance at the speed that the army wants to figure out, you can always keep the stone bullet from hitting the heads of our soldiers, in this case, the way Li Xiang said to attack under the cover of the stone bullet is completely feasible."

In later generations, when attacking, it usually needed firepower cover, and now, this tactic has been figured out by Li Jing thousands of years in advance, and it is not only the Goguryeo people who have groped for progress on the battlefield.

Soon, Li Jing's suggestion was implemented, and several lieutenants with paper, pens and rulers began to calibrate the elevation angle of the catapult and the landing point of the stone projectile, which allowed Li Shimin to see the role of arithmetic in the army.

In fact, this is Shanyang's batch of old catapults also need to be calculated and adjusted in this way, the ball bearings produced in Weinan, the new chariot with steel structure wheels, the elevation position, directly have an angle marking, and also use Sun's algebraic symbols, written with different weight standard bullets, in this elevation angle of the landing point distance, only need to recognize those numbers, you can easily grasp the landing point.

However, most of these chariots were assigned to the direction of the army in the middle of Hebei Province, and some were assigned to Li Ji, Niu Jinda and Chai Shao's army.

After everything was ready, all the other ballistas and obstacles in front of the city wall were emptied, and then, the soldiers with heavy shields and spears began to charge, and the neatly arranged catapults began to shoot at the head of the city at this time, and the falling stone bullets hit the heavy shields and armor of the Tang army, and the bells rattled, but they did not cause any damage to the Tang army, and the Goguryeo soldiers who were suppressed by the gravel and did not dare to go out of the shelter lanes could only let the Tang army enter the city, and then, this siege battle ended easily in half an hour, and, unlike before, The number of prisoners of war was extremely large.

"It seems that we have to learn to use these equipment more flexibly and cooperate with the tactics."

After this battle, Li Shimin had a lot of feelings, Li Jing and many other generals too, and the same is true of Hou Junji, who is hundreds of miles away, after he took over the command of the Middle Route Army, he has captured several fortresses in a row, and Liaodong City has been in sight, if, before the arrival of the alliance army of Goguryeo, this fortified city can be taken, then, when the Tang army faces the counterattack of the Goguryeo army, the casualties will definitely be greatly reduced.

Hundreds of miles away, Yuangai Suwen's army has marched to Daxing City, and now, he is facing a major choice, the Tang army is menacing this time, the three-way army, have already torn apart the basic defense of several military strongholds of the Goguryeo defense line, the upper road army has arrived under the city of Yanjin, the middle road army has attacked Liaodong City, and has threatened the city of Anshi, although the city of Beisha is strong, but has been facing the attack of the Tang waterway army, now, the coastal wharf has long been occupied by the Tang army, and the Tang army is constantly landing from the wharfIt is inevitable that the city will be besieged, so he needs to divide his troops to resist the enemy, and without the advantage of crushing the number of people, he is not sure to defeat any Tang army.

Moreover, behind his army, there was a small army that was haunting, only three or four thousand people, and dared to bite his army of 800,000 to fight guerrilla warfare.

This team is led by Zhang Gongjin, who broke through, and the main body is Zhao Long and other Sun Mansion guards and the recruits they recruited, these soldiers have had more than half a year of sea training, Zhao Long originally planned to train them to take over Sun Xiangfu's sea mission, but after Zhang Gongjin saw their physical fitness, he felt that only by letting them see blood on the battlefield could they complete the transformation of soldiers to elite soldiers.

The newly recruited staff is only 3,000 people, and under the leadership of the 800 veteran team members, they are very well executed the various orders issued by Zhang Gongjin.

Guerrilla tactics, due to Wei Chigong's unremitting propaganda, have long been no secret among the senior generals of the Tang Dynasty, this group of men and horses has the advantage of retreating by sea, often after a surprise attack, they will immediately shield the sea to supply what they need.

And, when fighting, it is rare to fight head-on with the Goguryeo army, usually a few rounds of arrows with a quick crossbow, killing and injuring hundreds of thousands of people, and then withdraw without hesitation. The morale of the Goguryeo coalition army, which was already uneven, would drop dramatically and the morale of the army would be weakened.

Zhang Gongjin's strategic vision is second only to Li Jing among the many commander-in-chief generals in the Tang Dynasty, he naturally sees the benefits of dragging down the Yuangai Suwen army and buying time for the main army to attack, even if he takes some risks, he also thinks it is worth it, but after a few battles, he found that he still underestimated the strength of these three or four thousand people, or rather, the power of the equipment they were equipped with.

Each of these more than 3,000 people wears more than two crossbows, each ten-person squad, and a telescope, and there are a lot of various equipment and supplies on the ship, they can be used openly, usually, they march up, they don't have to worry about being ambushed, hundreds of telescopes, can detect all the movements around them, and their whereabouts can also be hidden very well.

Moreover, even eating and drinking were prepared on the ship, and when marching, even the trivial tasks of lighting a fire and cooking were saved, and the speed of marching and moving was much faster than that of the Goguryeo army.

When they finished using the equipment they brought out, they were still able to turn around and retreat into the forest, and quickly replenish in the position where the supply was placed in advance, and those Goguryeo troops did not dare to enter the forest to pursue them, and they couldn't pursue them if they wanted to, because these people were all Lingnan people, and their ability to walk in the deep mountains and old forests was much stronger than that of the Goguryeo coalition army.

Since the Gaode army was defeated and led the remnants of thousands of men and horses to retreat to Laizhou, Zhang Gongjin led these three or four thousand people to chase after the butts of the 800,000 Goguryeo coalition army for half a month, killing at least 20,000 enemy soldiers in more than a dozen battles, and slowing down their journey for several days, with remarkable results.

Faced with the increasing losses and the battle reports that the various walled cities had been uprooted from the front, Yuangai Suwen was annoyed, and at this time, a middle-aged man dressed as a Han scholar entered his tent.

"General Yuangai Suwen, let's meet again."

"Are you, Wang Hao's son?"

The middle-aged scribe smiled and said, "The general has a good memory, but it's just a one-sided relationship, and he still remembers it." ”

"Did Prince Wang Hao send you?"

"That's right."

"But what is he going to teach me to break the enemy?" Yuangai Suwen is not a fool, he knows that Wang Hao has his own purpose in helping him plan before, but, in order to get what he wants, he chose to cooperate with Wang Hao, and at present, it seems that the cooperation is very successful, he launched a coup d'état, killed King Rongliu, and completely defeated the Gao army that supported Gaode, and completely mastered Goguryeo.

It's a pity that what he didn't know was that Wang Hao helped him to plan, and what he wanted was not for profit, but to destroy the country of Goguryeo.

Seeing Yuangai Suwen's eager look, the middle-aged scribe nodded and replied, "Of course, I not only brought you a sharp weapon to deal with the Tang Army, but also brought you an important piece of news. ”

"Sharp weapons? What's important? Please tell me more about it. ”

The middle-aged scribe clapped his hands, and immediately, one of his attendants brought in something like a wine jar and placed it on the handsome case of Yuangai Suwen.

"This thing, called fierce fire oil, is produced in the Western Regions, and was brought back from the Western Regions by the Turkic Turkic Khan for siege and fortification, which is very effective. As early as more than a year ago, Wang Gongzi sent a lot of fierce fire oil to your Goguryeo territory through the Wang caravan, you only need to do this, the Tang army will inevitably suffer heavy losses, and if you use these means against the upper road army on the front line of Yanjin, then the other two Tang armies will also collapse without a fight. ”

Yuan Gai Suwen asked again puzzled, "Why is this?" ”

The middle-aged scribe replied with a smile, "Because, the Tang Emperor Li Shimin, at this time, is in the Yanjin Road Army. ”