Yanjin on the south bank of the Yellow River, Tian Yu led a number of horses here to observe.

As an important port and wharf for crossing the river, Yanjin has been completely abandoned due to the war, and many beacons have been arranged around it to strictly check pedestrians from the north and south.

Even a cordon has been established between the beacons, that is, the areas between the beacons that are conducive to passage and crossing, laying sediment and artificially creating a flat and soft narrow strip. If people and beasts pass, they will definitely leave footprints.

In addition to the beacons, there are also patrol sentry horses.

Tian Yu was dressed as an ordinary sentry at the moment, so as not to stimulate the elite cavalry of the Wei army...... With such a large defensive line, Yanzhou was once an area ruled by the Wei State for a long time, so it was normal for spies to appear in the Fengsui along the Yellow River.

Even, it is very possible that the elite cavalry of the Wei army is scattered and hidden in several Yanzhou army beacons and tulou.

Dongjun, Chenliu, and Yingchuan are directly connected to Nanyang and Jiangdu, and there are some fixed smuggling channels among them, which is also a tacit matter for the high-level of both sides.

For example, Shu brocade, an important specialty of the Han Dynasty, can only be sold in the market of Wei to reflect the greatest value.

At present, Wei is extremely rich in livestock, and there is still an incentive to smuggle abroad.

Cattle and sheep, how can they be compared to Shu brocade, coral, and pearls?

A mature, hard-to-break smuggling route is right under the nose, and the full pet on the opposite side will naturally take advantage of this.

But Ma Liang couldn't help it, and the livestock smuggled, sold, and exchanged for Shujin was still used in the four states of Kanto.

Without smuggling, the value of Shu brocade will plummet, and Yizhou's influence and right to speak will naturally decrease.

As far as the interior of the Han family is concerned, Tian Xin is notoriously simple, and luxury goods such as Shu brocade are not rare at all. Up and down, no matter how much the officials of the Beifu family like Shu Jin, they must also suppress and restrain the demand in this regard.

In previous years, Jiangdong, where the bulk of Shu brocade sales, was demolished and emptied, and the main consumers of Shu brocade were Jiangdong ministers, and most of these people forcibly moved to Lingnan.

Guan Xing, Zhuge Jin, and Zhuge Ke, who actually manage the Jiangdong region now, are also pragmatists...... No one wants Shujin in Yizhou, what's the matter with this Guanjiangdong?

Jiangdong has always been an important textile base, and has a tradition in this area, which can not only meet its own needs, but also export to the outside world. itself is a competitor of Shu brocade...... Now without Sun Quan and others, the textile industry in the Jiangdong region is gradually recovering.

Qingzhou and Guqi have a strong background in business, textiles and pottery, especially after Zhang Fei got the new loom compensated by Tianxin, they also began to imitate and promote it on a large scale.

As a result, since the beginning of this year, Qingxu and Xuzhou have been saturated in textiles, and Yanzhou and Yuzhou, the two states and counties with the most war trauma and the slowest recovery, have begun to sell silk fabrics.

Qingxu Erzhou is the most excessive, and it will make a fuss about silk fabrics and directly impact the Shu brocade market.

At present, Jiangdong is mainly producing silk and has not carried out secondary processing; Nanyang and Xiangzhou also do not have large-scale silk fabrics, and the main output is coarse silk and linen.

Therefore, the silk fabric materials of Qingxu Erzhou come from Jiangdong, which is the choice of Qingxu merchants, Haoqiang, and families, and the importance of Shu Jin to the Han family's finances has nothing to do with them, they just want to make money.

Jiangdong also wanted to make money, but the equipment was insufficient, so he took the cocoons to Qingzhou in exchange for other resources.

The economy of various places is gradually recovering, and it is in the same country, and the windfall profits of Shu brocade are fading...... If the domestic sales are not good, then they have to be smuggled and sold to the enemy.

Anyway, Shu brocade is a luxury product, and the more you sell, the more cost-effective.

It is related to the status and influence of Yizhou in the entire Jihan Empire, and also affects the acquisition of agricultural and animal power in the four states of Kanto, and maintaining the smuggling channel has become one of Ma Liang's government affairs.

As for the military losses caused by the smuggling routes, they can barely be beared.

Tian Yu has nothing to say about this, his task is to fight, not to study the economy.

In Yanjin, he could see the Qingshui estuary on the north bank of the Yellow River, the estuary where the clear water flows into the Yellow River.

This kind of estuary, which extends into the heart of Hebei and is a waterway channel, is often an important military stronghold.

Cao Cao's attack on Yecheng and the pacification of Wuhuan were to transport grain and straw by water and reduce the pressure on logistics and transportation. In particular, in the first battle of pacifying Wuhuan, the white ditch was dug to transport grain, which was the most cost-saving military grain transportation plan.

The Wei army fought Jingzhou once, and then sat and watched Sun Liu encroach...... It is because there is no wide canal suitable for the army to transport grain between Yexian and Wancheng.

In addition, there were more important things in other aspects, so they kept delaying until they couldn't hold on, and then Cao Ren set up an army to conquer the south, preparing to fight Guan Yu and relieve the siege of the Hanzhong battlefield.

It can be said that the Han army could go straight to Yedu through Qingshuikou by water transportation.

In the future, the decisive battle with the Wei army will either cross Xiaopingjin and Mengjin from Luoyang in the east and go straight to Hanoi; Either the central part of Yanjin, Qingshuikou, Baimajin, Liyang line; Then the western route will take Puyangjin, Guanjin, Gaotangjin, and Cangtingjin.

The ferry crossing, which is connected to the main road, is the advantage that the defenders must defend in the event of a decisive battle.

And a few ferries close to the mouth of the river were even more important, as long as the Wei army was lost, the Han army could rush straight to Yedu at a very fast speed.

The Han army fought the Wei army, and the Wei army fought the Han army.

Tian Yu deliberately came to Yanjin to observe Qingshuikou, which was inclined to choose this place as the main river crossing site in the future.

When the Han army attacked Hebei and fought a decisive battle with the Wei army, it showed that Luoyang had been recovered, and the upper reaches of Yanjin and Qingshuikou had been controlled by the Han army...... In this way, the Wei army did not dare to hoard heavy troops in the Hanoi and Chaoge areas, which risked being gathered and annihilated, and was not conducive to giving full play to the advantages of the Wei army's cavalry.

Therefore, if the Wei army wants to win the field battle, when it cannot hold the line of the Yellow River, it will naturally let the main force of the Han army cross the river, and then have a field decisive battle with the Han army in the open area.

Different from the lower eastern line with flat terrain, after the Han army crossed the river on the western front, there were mountains at the southern end of the Taihang Mountains and the Black Mountain Range as barriers...... There is an opportunity to occupy a favorable location, build a fortress, hold on to the Wei army, and compete with the national strength.

Only by crossing the river in the upper reaches can we take advantage of the favorable terrain to take root and garrison, turn from attack to defense, and enter the stage of stalemate with the Wei army.

Cavalry superiority of the Wei army...... The longer the confrontation lasts, the more the Wei army will suffer in terms of logistics!

The Wei army annexed the Xianbei tribes, and with the habit of Hulu, it was not durable to fight.

As long as the war enters the stalemate stage, and the enemy turns the offensive to defend the north bank and set up a stronghold, it is equivalent to strangling the neck of the Wei army with a rope, which does not need to be strangled too tightly, and can make the Wei army frantic and make mistakes, or continue to weaken.

The key is to turn the offensive into the defensive, without the Beifu soldiers to participate in the decisive battle, the Han army lacks cavalry, and the decisive battle in the field is very disadvantageous.

If you win the battle, it will be difficult to expand the results of the battle, but it is possible that when you pursue, you will be defeated by the cavalry.

Switch from offense to defense, rely on fortifications, and no matter how you fight, you will not suffer.

What's more, there are mountains in the upper reaches, and the mountain soldiers of the Han army can exert their effects, and there are fighters that intersperse, break off, encircle, and bite the main cavalry of the Wei army. Fighter planes are very important, and with fighter planes, there is the possibility of destroying the country in World War I.

Unlike the downstream, it is flat and vast, and the Han army has no danger to rely on. Even if the decisive battle is won, even if the Wei cavalry is defeated, the Han army will not be able to catch up, let alone let go of their hands and feet to chase.

Therefore, the fighters that destroyed the Wei State in World War I could only be in Hanoi County.

Only by destroying the Wei State in World War I and increasing the size and prestige of the imperial court in all aspects can we continue to suppress the Northern Mansion and strive for a peaceful settlement of disputes.