Li Xiang rested for a day, after all, after a long journey on the road, including his subordinates, even if they are all made of iron, they have to take a good rest now, otherwise there will be no way to exert 100% combat effectiveness on the battlefield, a simple rest time can restore our combat effectiveness, and we will be able to solve the battle faster when fighting.

Of course, Li Xiang's energy is very strong, and the next day when the other soldiers were still resting, Li Xiang was already inspecting the battlefield with Su Dingfang and his subordinates, and Su Dingfang could introduce Li Xiang to the area in front of him with his eyes closed.

"Dashuai, since the people of Goguryeo knew that we were going to attack them, a large number of troops have already withdrawn to the south of the Datong River, if there is no miscalculation in the next place, the people of Goguryeo should be ready to give up the land north of the Datong River."

Su Dingfang pointed to the large wasteland in front of him and said, two years ago, this was still the most important grain producing area in Goguryeo, supplying millions of people in Goguryeo every year, but because of our harassment, this place has been deserted for more than a year.

"It's a normal thing, if they hadn't lied, maybe they would have continued to fight with us, and they were still fantasizing that they had the blessing of the gods and could repel our army, now I guess I'm waking up, you focus on the city in Jiangbei."

To the north of the Datong River, the Goguryeo people did not form an effective defensive line, but built one small city after another, relying on the horns between the small cities, they resisted the repeated attacks of Emperor Yang of Sui and Li Shimin.

I have to say that there is nothing wrong with Goguryeo's strategy, Emperor Yang of Sui and Li Shimin are both masters of great success, when they attack Goguryeo, they must be pushed over by a horse and a flat river, and no city can be left behind, but in the era of cold weapons, as long as there is a city with a wall, it is basically easy to defend and difficult to attack, after all, there is no large-scale siege equipment in this era, and it can only be filled with human lives.

At the beginning, the morale of all the soldiers was high, and they didn't care about the casualties of their own team, as long as they could take a city, then it would be a victory, but as the war progressed, the number of casualties became higher and higher, and some people were afraid that they would not be able to hold on.

Before Li Xiang set out from the capital, he had already thoroughly studied the two battles in history, Goguryeo relied on these cities to block the advance of the Tang army, and then slowly wore out the vigor of the Tang army, and when the morale of the Tang army declined, they only needed a little counterattack, so the morale of the Tang army was even lower.

Although it was not yet defeated, Li Shimin at that time also understood that it was basically impossible to have any hope of continuing to attack with such a demoralized army, except for increasing casualties to the Tang Dynasty, there was no good effect, so Li Shimin could only take the opportunity to return to the dynasty.

Strictly speaking, it is not a defeat, but the rulers on our side are more rational and think that it is not beneficial to continue fighting, of course, it was indeed a defeat during the period of Emperor Yang of Sui.

"Dashuai, originally they had thirteen small cities in Jiangbei, according to our reconnaissance, in the retreat some time ago, it was already half of the retreat, and now there are six small cities left, even so, their defense is insufficient, originally there were three thousand soldiers in each small city, but now it is estimated that there are not even two thousand, and the food supply is also insufficient, and the combat effectiveness has dropped by more than half."

Although he couldn't attack with the main force, Su Dingfang was not idle for a while, and his subordinates were staring at the Goryeo cities north of the Datong River, which had not been established for a long time, at most about twenty or thirty years, and there were not many ordinary people living in them, but the city wall was extremely strong, which was also a reason why Li Shimin couldn't attack it for a long time last time.

The most important city is Anshi City, here is the second largest stronghold north of the Datong River, the first stronghold is Liaodong City, the last time Li Shimin attacked, he occupied Liaodong City at the fastest speed, and now the entire Liaodong City has been burned down, so the first stronghold is still the original Anshi City.

According to the results of Su Dingfang's current investigation, there are only three cities in the entire area north of the Datong River that we need to pay attention to, one city is naturally the hard bone Anshi City, and the other two are Baiyan City and Black Bone City.

The last time Li Shimin attacked, these three cities, plus Liaodong City, constituted the entire Goguryeo defense line in the north, and the garrison of each city exceeded 15,000 people, plus a large number of ordinary people in the city, their actual combat strength was more than 20,000 people, so Li Shimin had to press step by step, one bite at a time.

But now there is no need at all, according to what Su Dingfang said, there are 2,000 soldiers killed in each city, of course, there will be a large number of soldiers in the city, these people are not trained in peacetime, and they can be pulled up to the city tower at will during the war, in fact, it will not play much role.

Li Xiang looked at the strongholds one by one on the map, and a smile appeared on his face.

"After three days, the attack will begin, and within five days, the White Rock City and the Black Bone City will be taken, and then the soldiers will go straight to Anshi City."

"Subordinates obey."

Without detailed discussion, Li Xiang had already issued a combat order, and Su Dingfang and his generals did not refute it, it is really that these cities are already weak, and if we attack these cities and still need to study for a while, then we really can't say anything, it's really embarrassing for Datang.

In this land, Goguryeo scattered more spies, they thought that the Tang army would delay the attack for a while, who knew that on a sunny morning, the Tang Dynasty's 25,000 troops arrived in Baiyan City.

Many Goguryeo spies didn't understand what was going on, and originally thought that the Tang army was going to the land of Goguryeo to make trouble as before, but this army was a little different from the previous ones, because this army carried a large number of war crossbows.

"Dashuai, isn't this the ballista that forced Tuyuhun to surrender?"

Su Dingfang and his men also saw these things, although Goguryeo is relatively weak now, if it is only relying on human lives to attack the city, a city will have one or two thousand casualties, but if there are these things, we don't have to go out with these two thousand lives......