In the mountains and forests, Zuo Zhishu trekked on foot, looking around at the surrounding mountains, which were the next battlefield and their home field.

The princess has to stay in Tongguan, and I am afraid that there are also considerations in this regard, home advantage. Zuo Zhishu walked at the front of the line in jet-black and shiny armor, the long sword at his waist dangled, and in his hand he held an earthen jar, which was stuffed with strong black powder and some iron shards, in short, this is a fragmentation mine that will kill if you step on it, and even the pain will not be left for the enemy.

His understanding of gunpowder was learned from the princess, seven or eight years had passed since that time, and that day the princess began to teach, at first he thought it was a Taoist priest's magic, able to pray for wind and rain, and when he saw the princess use such a fine cloud of black powder to blast a stone, he knew that this was a power more powerful than immortal arts, the power of pure matter!

It's a recipe, a recipe that fires, a magic formula.

Zuo Zhishu would think of this every time after dispensing gunpowder, holding the earthen jar, putting it aside, digging a pit and burying a trap with the surrounding sergeants, as long as he stepped on it, it would touch the small fuse placed inside, the flint and gunpowder rubbed against each other and ignited a spark, from the small spark to the big spark, followed by a colorful scene, the flames came out of the ground, blowing the enemy away.

After three busy days, the Black Armor Army withdrew to Tongguan, and Zuo Zhishu also reported to the princess that the task had been completed.

A hundred miles away from Shaanxi County, Shi Siming and Cai Jin had already set off, but the army was divided into two columns, and they were both on guard against each other.

Shi Siming didn't know that there was an incident in Luoyang, and he left Bo Lu to preside over various affairs in Luoyang, his most trusted subordinate.

On horseback, facing the not-so-scorching sun, Shi Siming's mind always reflected all kinds of unfortunate news that he had heard from the Hu people of Shaanxi County.

For example, the black sergeants who are as indestructible as the torrent are like thousands of horses galloping, and they are unstoppable, among them are the Hu Sergeants who experienced the terrifying black torrent crushing in Zhongnan Mountain, they have no courage now, and they don't dare to take another step towards Tongguan, if they don't leave the army, they can't survive, Shi Siming can completely conclude that they will definitely flee from here and go to other places.

Also, when the roar of thunder sounds, there will be fireballs in the sky, and then the entire army will be blown apart, and the soldiers will be set aflame along with the land and burned to ashes.

Shi Siming remembered what the second prince said, always pay attention to the flames in the sky, for the black armor army, from the initial contempt, to the current attention, or rather, instinctively afraid, such a black torrent is impossible to defeat, attracting the heavenly thunder, summoning the heavenly fire, just like the immortal army.

The only thing of value, he also sorted out, first of all, to call this army the Black Armor Army, it is better to give him a more accurate name, the Black Armor Red Banner Army.

The basic tactics of the infantry, the shield attack, the knife and axe hand in the middle of the attack, this is what they are lacking in, the original black armor is already very hard, plus the shield advances, it is almost difficult to break, and what is more terrible is that the archer is in the middle and rear position of the shield soldier, which is convenient for rapid fire in front.

Shi Siming felt a little tired, but as a general, he still had enough physical strength to continue to move forward, he didn't feel like this before, maybe it was because he was getting older, he picked up the water bag on his waist and poured it a few times, he felt much more comfortable.

Continue to think, just now is the infantry combat method of the Black Armor Red Banner Army, then, one of the things he cares about the most is the charge of the cavalry, according to the surviving sergeants, the cavalry of the Tang Army are all dressed in jet-black armor, even the war horses are the same, and there is a kind of half-cut broadsword, and the light cavalry all use crossbows with a range comparable to bows and arrows, and the short arrows are fired.

In addition, there is a kind of military formation that they have not touched, and it is also a military formation that releases the heavenly fire, Shi Siming smacked his lips, the mysterious military formation is likely to be the bottom chess of the black armor army, they are often hidden at the back of the formation, and there are even other black armor sergeants to protect them.

Shi Siming understood that the key to victory was in that part of the mysterious military formation. For that part of the military array, he had to make two assumptions, one was that it could be used on the city wall, and the other was that it could not, and it could only be used on flat ground.

In any case, he is 100% sure of the capture of Tongguan, no matter how far the immortal weapon can reach, it is always a long-distance battle, he has prepared three thousand catapults, as long as the dead soldiers are formed, and the ladder is built, the defenders of Tongguan can suffer serious losses, for many years, he will not care about the number of sergeants killed, victory is the most important thing.

Le turned his horse and came to Cai Jin's army, found Cai Jin, and saw this square-faced general, Shi Siming was never happy, but for the sake of the next war, he still wanted to use the other party.

"General Cai!" Shi Siming rode a war horse and went hand in hand with it.

Cai Jin glanced at Shi Siming coldly, the small eyes on his square face always exposed a sense of repulsion, but they were also fleeting, and he said in a skillful and sleek tone, "General Shi, what wind blew you here?" This is the marching army column, and the hospitality is not thoughtful and looks at Haihan! ”

Shi Siming also understands people, they don't deal with each other, they are cynical when they meet, and shout with a rough voice, "Don't I have something to discuss?" In a few days, we will reach the mountain forest east of Tongguan! With 3,000 trebuchets, we can't march quickly! General Cai is needed to hold several important mountain forks, which are important places for surprise attacks, and it is easy to make mistakes! ”

"Oh?" Cai Jin was suspicious, his mouth was full of doubts, and at the same time he looked at the surrounding generals for advice.

At this time, Cai Jin's cautious belly was high and he stepped forward, and gave his hand to the two generals without difference, "My subordinates have seen the map around Tongguan, it is true, if you want to camp there, you must guard the four forks, if there are no soldiers to defend it, the enemy is likely to carry out a surprise attack from there!" ”

Cai Jin looked at Gao Dada and motioned for him to go down, since Shi Siming did not lie, but he did not rule out the possibility that the other party would let him try the road, but because of the face of the same general, he agreed to this request and let his troops walk at the forefront of the military formation, and only care about these four forks in the road at that time.

After Shi Siming and Cai Jin agreed, he went back with a cold face, this battle, I'm afraid I can't count on this royal family, and the prejudice against Cai Jin is even more intense, Shi Siming feels that taking Tongguan and sharing a piece of the pie with this guy is really letting this person take advantage of the fisherman in vain.

Ruthless in his heart, Shi Siming clenched the scimitar on his waist, and as soon as he had the opportunity, he would cut off Cai Jin's head with his own hands.