When Su Gaiwen's troops faced the advantage of the number of troops in the Sui State, they could only choose to use guerrilla methods to avoid conflicts with the main force of the enemy's release side. They were very clear about their advantages.

The Sui army suffered a lot in the three battles, and the food and grass were convenient. Even after landing in the Korean people, they were not afraid, because they knew that transporting troops from the sea was very limited, and the food and grass would take a long time to transport them.

However, according to their observation, the Sui Dynasty did not have much food and grass, so Su Gaiwen used this tactic of luring the enemy, which was to lure the enemy into the ambush circle, then attacked the enemy with superiority, using bricks, stone tiles, bows, arrows, crossbows and arrows.

Originally, this tactic was nothing to more than 100,000 soldiers and horses, but the actual situation was very different. The method used by the Koreans did very little damage in the morning, but they could not withstand the harassment every day.

After a while, dozens of people were injured today and dozens of people tomorrow, not fatal, but bringing these wounded people can slow down the schedule of the Sui army. If you give up, you will let these people die directly.

It was not long when the dilemma was still there. After the battle, the Sui State soldiers broke through the defense lines and finally retreated without supplies. The Goryeo soldiers who also blocked the Sui State soldiers were also considered huge.

Su Gaiwen believes that it is very necessary to make people intercept the frontal battlefield, and even sacrifice is equally important. Otherwise, he thought that the attack speed of the Sui soldiers might fight to their city with all their might, so that the supply of food would support them to continue fighting.

Although the final loss was huge, the final defense line was also defended.

After the Sui soldiers retreated on a boat, Su Gaiwen immediately took his people back to the side of the city wall on the mountains. Not long after, he discovered that the vanguard soldiers had taken action.

Su Gaiwen felt bad all over. At least 100,000 vanguard soldiers observed by the spies had left. The spies wanted to get close to each other and were found. They fled all the way back, but when they came back, they were already dying.

And the final information is of no value.

Su Gaiwen could only think about it better. Now that there is a city wall as a barrier, he is very relieved even if millions of soldiers come, but he just doesn't know what the vanguard soldiers should do to dispatch so many soldiers.

Li De personally led people to fight for the north. During the journey on the vast land, no people were found in the forests, and the resources of Tianbao were abundant.

Li De came for resources.

It is boring to travel, and they are very fast. They spend all the rest of their time on the journey except for rest. The vanguard's legs are like eyes, and every direction is clear.

After formulating the plan, the scout of the vanguard had already set out to explore the way, and drew all the places passing by into maps. For distance measurement, they were all made using the rangefinder developed by Li De'er craftsmen.

It is to carry this unique rangefinder behind the carriage to calculate the distance length based on the number of runners. Their task is to survey and map, mark and draw maps.

The process is very long and not completed by one person, but a whole team is carrying out. The scouts are just responsible for exploring the way, as well as accompanying guards and surveying personnel.

Once you master the map of your belief, it will naturally be much easier to travel. The Pioneer Army also made signs on the road, all for future considerations. It is easy to get lost near the mountains.

The scouts had already established a gathering place, a very small and hidden place. After the vanguards arrived at the first front station, after a day of rest, 150,000 people began to get busy.

The supplies they carried were also in hand. In a few days, a simple barracks were built. Without any brick, stone and wooden walls, observation posts were set up on the periphery, and areas were divided around the outposts.

Soldiers rested in the same tent as usual. More than a dozen people could live in a tent. A few days were originally used by scouts as an outpost for observation, but now it has become the base camp of the vanguard soldiers.

"How far is it from the Northern Barbarian Tribe?" Li De asked.

The scout in charge of the observation had already investigated the situation clearly and immediately replied, "Twenty miles away, there are several union tribes living in this place, with more than 30,000 people and cattle, sheep and horses. However, it is not the Northern Barbarians, but a branch of the Tiel tribe. The specific situation cannot be verified."

The scouts told the truth. They were not very clear about the situation between tribes, but only knew some tribes, such as the Turks and the Northern Barbarians, who could be judged by their appearance and dress and language.

However, many tribes have different customs and habits. It is already considered to be an extraordinary experience if the scouts can tell that they are one of the Iron Les.

"He Bida, send our scouts to investigate the situation, so that Shi Huaiyi and Luo Song are ready to go out at any time, remember that the vanguard soldiers should not be too close and wait for news about the scouts." Li Dedao.

"Yes." He Bida agreed.

The commanders all had a clear division of labor. Li De was waiting for the return of other scouts in the barracks. It was impossible for the Liaobei area to be too big to conduct a complete search.

It is impossible to disperse all 150,000 people, as it is easy to alarm the enemy. Let the tribes here learn about the situation and they will quickly gather together. At that time, even if they don’t want to fight a tough battle, they will fight.

Li De still felt that it was safest to defeat one by one without hesitation, and could minimize the losses.

Moreover, not all peace is resolved through war. Many tribes are the same as those of the Sui people. They want a peaceful and safe life.

It’s just that the living environment makes it impossible for them to achieve, but that doesn’t matter.

"Grandmaster, the new tribal resident was discovered, just northeast, with at least 20,000 people in their clothes..." The scout said the news he found believed it.

Not long after Shi Huaiyi, Luo Song and others were dispatched, they borrowed news from the scouts and found a tribe thirty miles away.

Li De marked all the locations they provided, and immediately sent someone to chase Shi Huaiyi and others back after seeing the situation.

"Governor, is there any change in the plan?" He Bida asked as soon as he entered the tent.

"Oh, you're here just right. Look at the information collected from the back door. The map is marked with the tribe that has been discovered." Li Dedao.

He Bida was very surprised to see it. If there were tribes on the map, it would be a gathering place for large tribes to unite ethnic groups.

If you attack rashly, the number of people between the two sides may not be advantageous.

The way the Turks can unify many tribes is very simple, either using resources, such as cattle, sheep, horse populations to exchange for union, or directly suppress them with force.

This method is not easy for anyone to use. For example, although the vanguard soldiers are powerful, there is one disadvantage that they do not understand the situation of these tribes.

"What happened to the Grand Governor, why are we so anxious to summon us back?" Shi Huaiyi asked hurriedly.
Chapter completed!