In fact, the military campaign against Goryeo began as early as last year when the Goryeo envoys were expelled, but the scale was not large.

After the two sides returned to a state of war after the Battle of Pingshan, Anton Du Hu Yang Lian immediately recruited the generals to negotiate. Because Yang Lian was born as a civilian official and was not good at commanding operations, he urgently needed military generals to give practical and effective battle plans.

However, although Yang Lian can get a lot of advice, not all of them are correct. Because at present, the highest-ranking military generals in the Anton Metropolitan Protectorate are Sima Gai Yanxiao and Changshi Huameng, both of whom are fierce generals, and it is not their strong point to give advice, and the weight of other people's words is insufficient, and the status of these two generals is also far away, so they dare not talk much, and as a result, the protagonist of this meeting became Gao Dingbian, the commander of the Tiger Guard Battalion.

Gao Dingbian believed that the current strength of the Andong Protectorate was not enough to launch a large-scale operation, and the front-line commanders were basically transferred back to Liaodong to deal with the attack of Tuqi, and the coordination ability of the troops was not good, and it would take a while to complete the preparations for the war, but they could not let the Goryeo people prepare for the whole time. Therefore, he suggested that the operation should be divided into three phases.

The first stage was a non-stop raid against Goryeo, and it is well known that Goryeo lost all its veterans in the Battle of Taedong River, and the remaining Kyoto garrison also surrendered, so the current army of Choi Jianjiang's regime was recruited after he went to Kaesong to recruit troops, and although these soldiers were also trained, they had little combat experience. If the troops of the Andong Metropolitan Protectorate were to be reorganized and used to deal with such a Goryeo army, it would obviously be possible to make up for some of the shortages of numbers, but this would require a premise. That is, the Goryeo soldiers could not be allowed to accumulate combat experience during the raid and harassment operation. Therefore, Gao Dingbian pointed out that the goal of the first phase of the operation was to carry out an attack and harass operation against Goryeo by the Huwei battalion. As long as there is an encounter with the Goryeo army, we must destroy it completely. Ensuring Goryeo would not only result in the loss of personnel, but also the inability to accumulate combat experience.

In the second stage, after the Andong Metropolitan Protectorate had completed its preparations for war, it would attack Kaesong with all its might, striving to conquer it in the shortest possible time, so as to achieve the confidence that the Goryeo army and civilians would continue to resist.

The third phase was a parallel advance by water, in which the navy led by the naval governor Chung Mong-ryong would cut off Goryeo's retreat by sea, ensuring that Goryeo would not receive any form of assistance from the Wa kingdom, while sweeping away the remnants of Goryeo's resistance by land and thus completely subjugating it.

Yang Lian praised Gao Dingbian's proposal. Because he knew very well that the Tiger Guard Battalion led by Gao Dingbian in the previous combat operations with Goryeo had an extremely outstanding record, although his rank was not as good as Gai Yanxiao and Hua Meng, but his prestige in the army was already comparable to it. In addition, Yang Lian doesn't particularly like rough and reckless generals, and brave and resourceful talents like Gao Dingbian can get his praise even more. After discussing some detailed adjustments with Gai Yanxiao and Hua Meng, Gao Dingbian's proposal was approved.

As a result, Hua Meng and Gai Yanxiao began to train the army and adjust the personnel organization while defending against possible military operations in Goryeo on the border, while Gao Dingbian led the troops of the Tiger Guard Battalion to start the operation.

The attack on Gao Dingbian was simply fatal for Goryeo. Because the prestige of the Tiger Guard Battalion had long been widely spread in Goryeo, the soldiers had always feared this tiger and wolf army (which is also the reason why Su Chengdong, the capital of Liaodong, left this elite division in Goryeo and did not bring it back to the front line of the battle against Turk). Moreover, this army is all composed of cavalry, and it is elusive to come and go like the wind, and it may take ten times its strength to block this army, but even if Goryeo has such a force, it will not be able to complete the assembly and mobilization. If that happens, there will be a serious shortage of troops on the border between Goryeo and the Silk Country, and if the Silk Country takes the opportunity to attack, the situation will be unthinkable.

Since the Goryeo army could not be assembled against the Gaoding border. In this way, the Goryeo army became a group of poor stragglers who could not deal with him. They can only hide in their strongholds. If you rush to attack, you will be wiped out. But even this could not completely avoid the fate of being attacked by Gojeong-bian, because he would take advantage of the opportunity for the Goryeo army to go out to cut firewood to attack. Surprise attacks will also be launched on those relatively weak strongholds, and every time the Goryeo army encounters him will inevitably escape the fate of total annihilation, so following the notoriety of Wang Hanxin, the "man-eating red tiger", Gao Dingbian also gained the nickname "Black Tiger of Soul Eater".

Months of raiding and harassment operations cost Goryeo a total of nearly 4,000 soldiers, and more importantly, the movement and morale of the Goryeo army were damaged.

At this time, Gai Yanxiao and Hua Meng had already completed the preparation and training for the war, and Yang Lian immediately launched the second phase of the operation.

In terms of combat strength, Yang Lian does not have an advantage, the strength of both sides is about 40,000 people, but in terms of the combat quality of the soldiers, it is very different. Therefore, the most critical issue in this battle is suddenness, which will greatly tilt the balance of victory and defeat between the two sides. For this reason, Hua Meng led an army of 10,000 people to launch a sudden onslaught on Goryeo in the direction of Pyongsan, and the fierceness of the Pyeongsan defenders quickly became unable to resist, and they repeatedly asked for help from Kaesong.

Cui Jianjiang could not sit idly by and watch the fall of Pingshan, because once Pingshan fell, the gateway to Kaejo would be wide open to the country of Juan, so despite Chengyun's strong opposition, he still sent 15,000 reinforcements. This news was immediately sent to Yang Lian in Pyongyang by Gao Dingbian's fine work, and Yang Lian urgently ordered Gai Yanxiao to take action, so Gai Yanxiao's 25,000 main forces launched a rapid attack on Goryeo along the sea.

The Goryeo army stationed on the coast was originally the most elite troops in Goryeo, including some veterans brought by Chengyun, who could cope with Gai Yanxiao's attack regardless of troop configuration or combat ability, but due to the attack of Gaodingbian, they could only nest in their own strongholds to defend, and as a result, the communication and linkage between the troops were at a very low level.

Within five days of the war, more than two dozen strongholds along the Goryeo coast were uprooted. The remaining scattered strongholds could only protect themselves and could not threaten the actions of the army of the Silk Country, and Gai Yanxiao's troops soon crossed this carefully constructed defense line of Cui Jianjiang and advanced towards Kaesong. (To be continued.) )