Li Shimin was amused by Li Jue and burst into laughter, especially Li Jue's comment "knows how to manage a household," which made him laugh so hard he almost died.

"You, you..."

"You little brat, you have such a sharp tongue, hahaha..."

"It's not that our Tang army is good at managing money; it's just that we can't stand waste!"

"Moreover, the number of arrows a soldier carries is limited; generally, a single soldier carries a maximum of thirty arrows."

"Therefore, every soldier would pick up enemy arrows on the battlefield to supplement their own..."

Li Jue nodded secretly upon hearing this, and then tentatively spoke.

"Grandpa, shouldn't we bring out Changsun Wuji?"

Upon hearing this, Li Shimin glared coldly at Li Jue.

"You have no manners!"

"Even I dare not address him by his given name, yet you, little fellow, keep calling him Changsun Wuji?"

Li Jue smiled awkwardly upon hearing this.

"Grandpa, I don't want to either, but what can I do when my eldest grandson uncle looks down on me..."

Upon hearing this, Li Shimin immediately wilted. Not only did he no longer pursue Li Jue's rudeness, but he also patted him on the head in a forgiving manner.

"well!"

"Your uncle's matter will be handled properly by your grandfather. You should still show him respect in the future..."

"As for when your uncle will make his appearance..."

Li Shimin looked at the battlefield again after saying this, and only when he saw that the Goguryeo heavy cavalry had gone more than ten miles away and was about to catch up with the Xiling camp did he order someone to pass on the order to Changsun Wuji.

"Pass on the order!"

"Order Changsun Wuji to cross the valley at top speed. He is not to linger or engage in prolonged battles. He must reach the rear of the Goguryeo army in the shortest possible time!"

"promise!"

Upon hearing this, Li Jue quickly looked towards the battlefield. He saw that the Goguryeo army had only advanced halfway down the mountain.

"Grandpa, if we let Grand Uncle Changsun's army come out now, the Goguryeo people will definitely come to stop us, won't they?"

Li Shimin nodded upon hearing this.

"Of course!"

“The Goguryeo people are not fools, and the commanders Gao Yanshou and Gao Huizhen are also knowledgeable about military affairs.”

"It's just that the Goguryeo army is no good, especially the group in the middle section."

"Take a look at their equipment?"

"Many people don't even have leather armor, so what are they supposed to use to protect themselves?"

"Comparatively speaking, the eleven thousand men led by your maternal uncle, the eldest grandson, are all heavily armored cavalry!"

Upon hearing this, Li Jue suddenly realized what was going on.

"Grandson understands!"

"Grandpa deliberately waited until Goguryeo moved their heavy cavalry to the front before letting Grandpa Changsun's heavy cavalry appear!"

Li Shimin nodded upon hearing this, and then patiently explained.

"That's absolutely right!"

"But war is just like that, it's nothing more than using your strongest and most powerful troops to attack the enemy's weakest and worst parts."

"The Mo Dao formation is an invincible weapon against light cavalry, but against heavy cavalry it is suicide."

"Similarly, when heavy cavalry faces light cavalry, they are in an awkward situation where they can neither catch up with them nor hit them."

“If the terrain is unfavorable for heavy cavalry to charge, the heavy cavalry will only be able to passively take a beating.”

"But heavy cavalry against infantry is like a demon descending or a tiger entering a flock of sheep."

"Look at what kind of people are in Goguryeo's rear guard?"

"Supply troops and auxiliary troops!"

"As long as your uncle Changsun's heavy cavalry gets behind them and then forms a battle formation to fight back, the Goguryeo rear army will definitely be thrown into chaos!"

While Li Shimin was analyzing the battle, Changsun Wuji's vanguard had already rushed out of the mountain pass and formed a five-man formation, firmly guarding the pass.

The Goguryeo army reacted quickly, immediately dispatching troops to intercept them.

However, their cavalry were all at the front, and the infantry they sent couldn't stop the heavily armored Tang army. Furthermore, the Tang army didn't engage them in battle at all, but simply fled towards the rear of their main force.

Therefore, Goguryeo launched a few attacks and then ignored the army.

However, the area around the mountain pass remains a site of intense fighting.

Goguryeo didn't know how many people were in the valley, so they could only desperately try to stop them with lives.

However, the Tang army was highly disciplined; every five soldiers who emerged automatically formed a battle formation, and when they numbered several hundred, they completely secured the mountain pass. Subsequent Tang soldiers then joined the battle, alternating their march with the previously formed formations.

Five more people were brought in, and five more ran away, keeping the number of people in Yamaguchi around three hundred.

This tactic of alternating cover during advance not only stunned Gao Yanshou, who was in charge of the central army, but also deeply shocked Li Jue, who was watching from the mountain.

"Grandpa, are our Tang Dynasty soldiers really that powerful?"

Li Shimin asked, puzzled.

"How come you're so amazing now?"

“Grandpa, look, they’re taking turns providing cover for each other during their march…”

Li Shimin curled his lip in disdain upon hearing this.

"Isn't this the proper thing to do?"

"In such narrow terrain, this is the only way to march safely!"

"Should I?"

Li Jue was speechless when he heard this. He dared to say that 99% of the world's armies couldn't do this.

This seemingly simple operation actually requires a very high level of skill from the soldiers.

First, soldiers must have absolute self-confidence.

This confidence wasn't just about their own equipment and martial arts skills, but also about their comrades, their commander, and even their emperor, who was sitting on the mountain watching the show.

Secondly, soldiers must be highly skilled in using various battle formations and have the ability to quickly regroup even when scattered.

Finally, and most importantly, is initiative!

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