Mythical Qin: I, Gao Yao, will never be a eunuch!

Hearing this sudden news, the mysterious Yi Xiaochuan, who was sitting in the tent, couldn't help but tremble all over, with a look of astonishment on his face. He had never expected that the Southern Border Army would enter Black Dragon's Mouth at such an astonishing speed. Such a swift action really exceeded his previous expectations.

Could it be that the enemy has already noticed that the army he led is chasing them closely? Thinking of this, the mysterious Yi Xiaochuan frowned and pondered in his heart. According to common sense, if the enemy knew that the imperial army was close at hand, they would not choose to risk entering the Black Dragon Pass. Because the Black Dragon Pass has a dangerous terrain and a rugged road, it is not an ideal way to escape.

However, the current situation is puzzling. What exactly caused the Southern Border Army to make such a seemingly unwise decision? Mysterious Yi Xiaochuan's mind was racing, and he quickly analyzed various possibilities. Suddenly, an idea flashed through his mind like lightning, which startled him.

"Not good!" The mysterious Yi Xiaochuan stood up suddenly and shouted loudly: "Come here! Immediately pass on my military order, order the vanguard troops to pursue at full speed, and the central army to follow closely. Make sure to block all possible escape routes of the enemy. Anyone who violates the rules or neglects military orders will be executed immediately!"

"Yes," the guards outside the tent responded in unison, and then hurriedly took the order and left. For a moment, the atmosphere in the entire camp was tense, and the sound of horns and horse hooves resounded through the sky. The imperial army all began to move and began to chase in the direction of Heilongkou.

The reason that drove the mysterious Yi Xiaochuan to act this way was actually not complicated. After careful consideration, he suddenly realized that the only possible reason behind the Southern Border Army's actions was the heavy rain.

The torrential rain had almost the same impact on both sides. The Southern Border Army was most likely trying to use this godsend opportunity to completely escape the dilemma of being chased by the imperial army. They were obviously deliberately and cleverly taking advantage of this sudden rainstorm.

At first, the mysterious Yi Xiaochuan did not rush to launch the pursuit. One of the important reasons was that he was afraid of alerting the enemy and disturbing the southern border army. After all, he could not know for sure whether Zhang Han had led his troops to the other side of the battlefield. According to the time, the other party should have arrived at the designated location long ago. But what is puzzling is that up to now, not only has there been no news about Zhang Han being attacked or obstructed by Han Xin, but even a little relevant intelligence has not been obtained.

This situation has undoubtedly become a problem that makes mysterious Yi Xiaochuan worried. After all, he has mobilized a large number of troops and made a big fanfare this time. If Gao Yao succeeds in escaping again under his close surveillance, then mysterious Yi Xiaochuan will definitely not be able to bear such a heavy blow and frustration. Not only did he almost die at the hands of Gao Yao last time, but he also missed an important opportunity to kill Gao Yao. This time, mysterious Yi Xiaochuan will definitely not hesitate again.

At this time, Zhang Han led his army through many hardships and dangers and was finally about to reach the other side of Heilongkou. However, during this long journey, the mysterious Yi Xiaochuan kept sending scouts to urge the army to advance, but because these scouts had to take a detour, the delay would be even longer. This was also the reason why Zhang Han had already arrived at Heilongkou, but the mysterious Yi Xiaochuan had not received any news.

Such frequent urging forced Zhang Han to speed up the pace of the march again and again, and the originally orderly troops, divided into the front, middle and rear armies, began to become somewhat chaotic. You know, Zhang Han had been rushing all the way, and the soldiers were already exhausted, but the military order was like a mountain, and they could only grit their teeth and persevere.

To make matters worse, it suddenly started to rain heavily. The rain poured down, mercilessly hitting the ground and blurring people's vision. Under such bad weather conditions, the roads became muddy and slippery, which brought great difficulties to the march. Moreover, because they were in the southern border, the terrain here was complex and changeable. Even the scouts responsible for scouting the road conditions and delivering messages were not very familiar with the roads in this area. Now, coupled with the obstruction of rain, their marching speed naturally slowed down a lot, but they were still in time and did not waste much time to reach Heilongkou.

However, when Zhang Han was hindered by the heavy rain and the news was not flowing, Han Xin, who arrived at Heilongkou one step ahead, had already quietly set up an ambush. Han Xin knew that speed was of the essence in war, and he would never let Zhang Han pass so easily. Therefore, at every key point where Zhang Han might set up an ambush along the way, Han Xin carefully deployed a small number of troops to hide in them. The purpose was not to effectively kill Zhang Han, but to pretend to deliberately delay Zhang Han.

These hidden ambushes had an important mission, which was to let Zhang Han clearly know that Han Xin had arrived here, and deliberately arranged some soldiers to stay behind to try to slow down Zhang Han's pace. Han Xin had already secretly dispatched a thousand elite soldiers to enter Heilongkou blatantly. These soldiers acted quickly, and once they entered Heilongkou, they began to create all kinds of marching traces.

On the surface, these traces seemed to indicate that Han Xin was leading a large army to rush to support Gaoyao. When Zhang Han personally led his army to rush there, the sky suddenly became overcast, followed by heavy rain. Faced with the scene before him, Zhang Han, who was originally full of confidence, hesitated at this moment.

Although the spies he sent out had reported the general situation in detail, Zhang Han still felt that something was not right. But what was wrong? He thought hard but could not put his finger on it. He just had a strong intuition that things were going too smoothly this time.

Compared with the previous difficult and costly attack on Nanhai County, the current situation was completely different. The numerous obstacles and setbacks encountered in Nanhai County were still vivid in Zhang Han's mind, and the current smooth progress made Zhang Han suspicious.

After careful consideration, Zhang Han decisively issued an order: "The front troops will immediately rush into the valley to search, the rear troops will stay where they are and be sure to guard against possible sneak attacks from the southern border troops, and the central troops will follow this general and slowly advance forward!"

"Here!"

As Zhang Han's command was like a loud bell, the 20,000 battle-hardened vanguard troops rushed into the pouring rain without hesitation like an arrow from a bow, and pounced straight towards the Black Dragon's Mouth.