The Zhu family brother walked in the front, and the wooden bridge under his feet made a slight creaking sound, but the bridge was very stable, even if the war horse he led stepped heavily on the bridge deck, it could only cause a very slight shaking.

Behind him, the soldiers of the cavalry battalion passed over the bridge one after another, separated by each other.

The wooden bridge over the water surface of Futun Creek, which is more than 100 zhang long, was built in only two days under the leadership of 3,000 Longwei soldiers from the Longwei Engineer Company.

Such an astonishing construction speed is mainly due to the many practical tools designed by Zhu Linmiao for the engineer company, such as hand-cranked winch, screw jack, gear hand drill, level, etc.

These tools do not actually require much complicated craftsmanship to make, and can be made by pure manual craftsmanship in the Ming Dynasty. But the ingenuity contained in it is far from what the craftsmen of this era could have imagined.

For example, this screw jack will be equipped with one in the family cars of later generations, and the structure is so simple that there are only six or seven parts, and the price does not exceed twenty yuan. But in the seventeenth century, this thing was simply an artifact, and in some specific cases it could even increase the efficiency of construction by a hundred times!

In addition, Zhu Linwei also introduced a large number of later prefabricated standard parts concepts to the engineer company. A large number of complex brackets, connectors, etc. are processed in advance, and the size and shape are exactly the same. During construction, it is only necessary to cut down timber to serve as bridge decks and girders, and then connect them with these prefabricated parts, and the construction work can be completed quickly.

And when the parts are connected, the engineer company of the Dragon Guard Army also has another "big killer" - iron nails.

In the Ming Dynasty, iron nails were made by manpower, and the price was very expensive, which was definitely a luxury.

Wooden utensils mainly rely on the tenon jointing process, digging grooves in the wood, and snapping the parts that need to be connected into them, which is to save iron nails. Don't say that ordinary furniture, architecture, etc., is to make sea ships, and the craftsmen of the Ming Dynasty are reluctant to use a few nails.

However, in just two days, the engineer company of the Dragon Guard Army spent tens of thousands of iron nails on this wooden bridge, which was worth thousands of taels of silver! The cost of this wooden bridge on Futun Creek is enough to erect seven or eight ordinary bridges.

But high investment and new technology bring high efficiency! Looking at the whole world, any professional bridge-building craftsman is difficult to match the engineer company of the Dragon Guard Army in terms of efficiency.

It only took more than an hour for the dragon guards and the infantry and cavalry of the broken battalion to cross the river, and it took less than two hours to cross the bridge with grain, grass, baggage and other goods.

The most troublesome thing is the cannon. This thing can easily weigh thousands of pounds, and if you pass it directly, it will exceed the limit of the wooden bridge.

Therefore, the cannons were disassembled, the lighter gun carriages were dragged away by horses first, and the heavy parts of the cannon body were cushioned with logs and dragged across the bridge little by little by manpower. And, to be on the safe side, only one barrel can cross the bridge at any one time.

It took a day to drag the Long Guard and the Broken Battalion more than 40 cannons of more than 1,000 catties across the river, and the infantry and cavalry brigades had traveled sixty or seventy miles away.

However, after crossing the river, all the artillery was carried by horse-drawn carts, and two days later it also caught up with the main force in front.

After crossing the Futun River, what appeared in front of the Long Wei Army and the broken camp was the flat road leading to Guangguang County, and it was only more than 500 miles along this road to Guangguang.

The army marched all the way along the south bank of Futun Creek in the northwest direction, and all the tents and equipment it carried were temporarily discarded, and the marching speed reached almost 60 miles a day.

At the same time, Azig was still circling along the Jianxi tributary, and the forward had just arrived at the lower reaches of Chongyang Creek, and there were still 400 miles to go before he reached Shanguan.

In the second year of Longwu, June 15.

Zhu Linmiao looked at the steep mountain range in the distance with a telescope, there is a majestic pass between the mountains, which is across the only path that can enter the mountain pass, which is the important place of Shanguan connecting Fujian and Jiangxi.

He pressed the telescope down slightly, only to see that there was a battalion of several miles below the Shanguan Pass, blocking the Shanguan Pass tightly, and it was the main force of tens of thousands of Jianjiao under Azig.

The camp has three layers, surrounded by camps, baggage and other things, and a trench is dug in the outermost part, and it is vaguely visible that there are still people digging deeper. Behind the trench, there were also two layers of horses and a large group of non-commissioned officers on guard, and many artillery pieces could be seen between the queues, all pointing outward.

In the camp, there are all kinds of banners, all kinds of infantry and cavalry with swords and armor are running endlessly, and all kinds of vehicles and equipment are frequently dispatched, and its momentum is very different from any enemy Zhu Linmiao has seen before.

"As the most powerful army in Asia in this era, the Jianyu regular army does have some strength." Zhu Linmiao shook her head slightly, "I'm afraid it's going to be a tough battle this time......"

However, he is not worried that Jianyu will immediately capture Shanguan, yesterday Shanguan sent the news, Yang Tinglin has sent Zhao Yinxuan to lead 3,000 Yunnan troops to garrison Shanguan, plus Huang Mingjun's department who previously guarded the pass, there are nearly 4,000 Ming troops on Shanguan.

With these 4,000 soldiers and horses, and relying on the dangerous terrain of Shanguan, it is difficult for Azig to quickly capture the pass.

According to the person who sent the letter, Dai Xiuyuan, who was recommended by Gu Yanwu before, was quite strategic, and led his strange troops to go around the back of the Qing army in Guangxin, burning the enemy camp, and turning the battle situation in Guangxin immediately. After that, in order to protect the grain road from being disturbed, Liu Guangbi had to send nearly three adults and horses to escort him along the way.

In addition, the morale of the captives was low due to the burning of the camp, Yang Tinglin and the Qing army formed a stalemate in the area of the Baita River, and even had the spare strength to divide 3,000 soldiers to help defend Shanguan.

"My lord," Shi Lin said to Zhu Linmiao's side, "the army has finished camping. All the generals gathered in the big tent of the Chinese army according to your orders. ”

"Back to camp." Zhu Linmiao put away the binoculars, got on his horse, and galloped towards the camp of the Dragon Guard.