After the expansion of the five battalions, there have been significant changes in both the infantry battalion, the shooting battalion and the Changshui battalion.

In the past, the five schools of the Northern Army were all single arms, the Vietnamese cavalry battalion and the tun cavalry battalion were cavalry, while the infantry battalion was pikemen, the shooting battalion was bow and crossbow soldiers, and the Changshui battalion was sword and shield soldiers.

However, after the expansion of the army, the limitations of this single branch of the army were clearly revealed, 10,000 men per battalion, as if to cooperate and complement each other, that is at least 30,000 men of the combat scale, maybe in a large-scale battle can be used, but coordination between each other is certainly very difficult.

Therefore, when the last expansion of 5,000 people, the third infantry battalion had already combined some other arms, although in terms of the main body, the infantry battalion was still dominated by pikemen, and the archery and Changshui battalions were still dominated by archers and crossbowmen, sword and shield soldiers, but each battalion added an appropriate amount of other arms as a supplement to strengthen the ability to fight independently.

After this expansion, the three infantry battalions have completely broken the barriers of the previous arms, and are no longer based on a certain branch of the army, but the balanced configuration of each branch, and each battalion has become an independent combat unit.

In fact, after this expansion, the differences between the three infantry battalions have completely disappeared, and the reason why the previous names are still retained is just for convenience.

Du pre-led the shooting battalion to guard the Shimen Pass, at this time, the shooting battalion was already a complete mixed corps, not only pikemen, crossbowmen, sword and shield soldiers, the most basic three types of infantry according to the optimal proportion of the configuration, but also added a number of auxiliary units of logistics support and equipped with catapults, bed crossbows, rushing vehicles and other large military equipment, so that the shooting battalion was completely reborn and became a team with independent combat capabilities.

However, Du Yu did not put all the 10,000 troops of the shooting battalion into the defense of Shimen Pass, according to Cao Liang's plan, the state army would not defend Shimen Pass, if a large number of troops were put into Shimen Pass, using the strategy of defending the enemy outside the country, and fighting hard with the Sima army with superior troops, it was not a wise strategy.

Moreover, although Shimen Pass is called dangerous, it is still a little less interesting than such dangerous points such as Tongguan, Jiange, and Yangping Pass, so Cao Liang sent Du to guard Shimen Pass, and he did not plan to defeat Sima Yi's army.

Now only the 5,000 men and horses of the Shooting Battalion are guarding the Shimen Pass, and their task is to delay the attack of Sima's army.

Although Shimen Pass is called Guan, but in fact there is no Guancheng, originally only in the position of the pass to build a section of stone wall more than a foot high, in the middle of the stone wall is a gap, the government set up a checkpoint here, for checking the passing pedestrians and merchants.

After Du pre-took over the defense of Shimen Pass, he heightened and strengthened the stone wall, and dug a lot of pits outside the stone wall, and the pits were full of sharpened wooden sticks, which were covered with branches and leaves and then buried in the soil, and it was difficult to find the existence of the pit without looking carefully.

In the position of the gap, I am afraid that it is too late to install the gate, so Du Yu can only order someone to cut down some trees to make a fence to block the gap.

On both sides of the stone gate, there are two huge vertical rocks, just like two huge stone gates, the smooth rock walls, there is almost no possibility of climbing, so the state army basically does not need to take care of the cliffs on both sides, only need to defend this pass.

But this pass is almost half a mile wide, although the state army has strengthened and heightened the stone wall, but the stone wall can't be compared with the real city wall after all, especially in the gap position, there is only a wooden fence, if you want to block the attack of the Sima army, it is not small.

However, Du was well prepared, he mobilized a large number of crossbowmen to climb the stone wall, and at the gap, a large number of pikemen were deployed, and the shooting battalion was in full formation, waiting for the attack of Sima's army.

Last night, Sima Jun had advanced to the foot of the mountain only more than ten miles away from Shimen, and the lights of Sima Jun's camping were clearly visible when Shimen was closed.

One of his subordinates proposed to Du Pre that a sneak attack in the middle of the night while Sima Jun's foothold was not stable, which could not only severely damage Sima Jun, but also demoralize him.

But Du Zhudu's nickname is not taken casually, he has been familiar with military books since he was a child, and naturally saw through Sima Jun's tricks at a glance.

Du Yu smiled and said to the generals: "Whoever sets up a camp, there are ten suitable and ten unsuitable, the enemy army is now camping with the door wide open, if it is not that the general who leads the army is too stupid, it is deliberate, trying to lure us to sneak attack, such a trick, if you don't know it, let them freeze in the cold wind, and you will not be accompanied." ”

On this night, except for the sentry posts on duty in turn, the rest of the soldiers of the state army were drilled into the camp tents, recuperating and waiting for the day.

As for Sima Shi's army, except for some of the troops in the camp who could sleep not very well, the army ambushed outside the camp shivered in the cold wind for a night, causing a lot of people to freeze.

Although this affected morale somewhat, Sima Shi didn't dwell too much on this matter, but set up camp and went straight to Shimen Pass.

When he arrived at Shimen Pass, Sima Shi looked at Shimen Pass, which was very different from his imagination, and was a little stunned, Shimen Pass, Shimen Pass, shouldn't it be a real gate?

Obviously, the gap between Shimen Pass and Sima Shi's imagination is too far, but Sima Shi was stunned, and couldn't help but secretly rejoice, such a simple Shimen Pass should not be difficult to attack.

Sima Jun lined up in front of Shimen Pass, and Sima Shi ordered the beating of drums to launch a powerful attack on Shimen Pass.

In the midst of the rumbling war drums, Sima Jun shouted, swarmed up, and rushed towards Shimen Pass.

The state army was already in full array, holding the spear tightly, the arrow was on the string, silently waiting for the Sima army to approach the pass, Du Yu had already ordered, as long as the enemy army entered the range of the bow and crossbow, it could launch an arrow attack, before that, even if it was to shoot an arrow, it was a waste in vain.

Sima Jun relied on the strength of the crowd, and the attack surface less than half a mile wide was almost full of people, and a large area of black crows and crows came like locusts crossing the border to cover and kill.

"Shoot the arrows!" Du Yu saw that Sima Jun had already stepped into the range of the bow and arrow, and immediately ordered.