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

All these carefully planned strategies and meticulous arrangements were based on Zhang Liang's extraordinary wisdom and foresight. At this moment, Kong Gang hurriedly walked to Zhang Liang's side, bowed slightly and asked, "Master Military Advisor, in my opinion, the time is almost up now. Should we order the army to advance?"

Hearing this, Zhang Liang slowly raised his head, first glanced at the surrounding environment, and then looked up at the sky. He saw that the originally clear sky was gradually covered by dark clouds, and it seemed that a heavy rain was about to pour down.

After a moment of silence, Zhang Liang suddenly asked softly, "Is it going to rain soon?"

Kong Gang, who was standing nearby, heard this and immediately nodded and replied, "Well, judging from the current changes in the weather, the rain should fall within an hour. Judging from the current situation, this rain is not expected to last too long, at most about an hour."

Obviously, Kong Gang was well aware of the climate conditions in the southern border. His long experience of marching and fighting here gave him a keen sense of weather changes, and he could almost accurately predict the approximate time range of rainfall based on his experience.

"Wait, when the torrential rain comes, it will be the time for our army to advance to Heilongkou!" Zhang Liang pondered for a moment and said resolutely,

However, when Kong Gang heard this decision, he could not help but show hesitation. He asked doubtfully: "Ah? Military Advisor, are we going to advance in this heavy rain?"

In ancient times, being caught in the rain was no small matter. TV dramas often depict characters catching a cold from being caught in the rain, but in real history, the situation was much more serious. If we consider the short-term explosive power, the plague may be more deadly; but if we look at it from a long-term perspective, this seemingly ordinary cold is actually one of the diseases that causes the most deaths.

The reason is very simple. First, not everyone can afford to see a doctor or get medicine when they are sick. For those poor people, seeking medical treatment is undoubtedly a heavy burden. Second, many ordinary people often do not pay enough attention to their own illnesses. They are busy with their livelihoods all day and have no time to take care of these minor illnesses, let alone take time to rest. As a result, what was originally just a small cold can quickly deteriorate into a serious illness such as pneumonia. Moreover, under the backward medical conditions in ancient times, once you suffer from such a disease, it is almost impossible to recover.

At this moment, the sky was covered with dark clouds, and it looked like a heavy rain was about to fall. Such bad weather was undoubtedly a huge challenge for Kong Gang who was on the march. He was secretly worried that if the soldiers were exposed to the rain for a long time, they would most likely catch a cold. Once this happened, the army's combat capability would be greatly reduced, and the next battle would become extremely difficult and dangerous.

"There is really no other way! Nowadays, there are more scouts around our army than ever before. In addition, the terrain of Heilongkou is unique. It is extremely difficult to use the same tricks as before to conceal the true number of our troops. If we are not careful, the enemy may notice the clues. At this point, we can only bite the bullet and continue to move forward in the wind and rain. The success or failure of this battle in the southern border depends entirely on this crucial battle. If this battle is won, I will go to the lord in person to ask for merits and rewards for all the soldiers. Moreover, I am willing to live and die with all the soldiers and fight side by side!"

While observing the situation around him, Zhang Liang sighed helplessly, then spoke loudly with a firm gaze, expressing without hesitation his determination to work hand in hand with the soldiers.

"Well, I will convey the order right away. Please rest assured, military advisor, if necessary, the soldiers under my command will surely move forward bravely without any hesitation!" Kong Gang responded with a fist salute, then turned and left, quickly passing the order to every soldier.

"Rumble... Rumble..." The deep and heavy thunder roared in the air like a war drum. As the dull thunder sounded, the originally clear sky gradually became gloomy, as if a huge black hand was slowly covering the entire sky. Then, bean-sized raindrops began to pour down from the clouds, hitting the ground with a crackling sound.

At first, the raindrops fell sparsely, but soon, as if they had received some kind of instruction, they began to fall in large numbers, faster and faster. In the blink of an eye, a heavy downpour swept over the sky and the ground, and the sky and the earth suddenly became hazy, with visibility dropping sharply.

When the sudden heavy rain began to wreak havoc, the army led by Zhang Liang showed no intention of retreating. They marched forward without hesitation, braving the pouring rain, and quickly advanced towards Heilongkou. Due to the heavy rain, the road became muddy and slippery, and the soldiers' marching speed was affected to a certain extent, but the overall impact was not too great.

At the same time, this heavy rain was undoubtedly a huge challenge for the scouts of the imperial army. The rain blurred their vision, making it difficult for them to see the situation in the distance. Despite this, they still did not dare to get too close to the Southern Border Army, because once their whereabouts were exposed, they would most likely be discovered by the enemy. Therefore, these scouts could only watch from afar, and through the rain, they could vaguely see a large number of Southern Border Army heading towards the Black Dragon Mouth.

Soon, the scout in charge of reconnaissance passed this important information to the mysterious Yi Xiaochuan who was in the rear of the imperial army. At this time, the mysterious Yi Xiaochuan was sitting quietly in the tent, thinking about the next strategic deployment. After learning about the situation ahead, Yi Xiaochuan frowned slightly. Although he had expected that this operation might not be smooth sailing, he did not expect that it would rain so heavily, which undoubtedly added a lot of variables to his plan.

The mysterious Yi Xiaochuan came here to eliminate Gao Yao. His injured arm has not yet fully recovered. If he goes into battle to kill the enemy, he may not be able to do it. Fortunately, with his outstanding military talent and rich combat experience, it should not be a problem for him to command the battle from the rear.

However, looking at the dark sky and the heavy rain outside the tent, Yi Xiaochuan couldn't help but feel a little worried. What impact would this rain have on the battle between the two sides?

"Report--" With a loud shout, a dusty scout rushed over and finally stopped steadily outside the tent. He didn't have time to catch his breath, and hurriedly bowed to report inside: "General, the Southern Border Army has begun to enter the Black Dragon Mouth, and the entire Southern Border Army is entering continuously!"