After doing these earthwork tasks, Qin Ning ordered the soldiers to dismantle the sensor alchemy products and the arrangement of the mechanism, and at the same time widen the width of the tunnels they were advancing, and the soil cleared out could be used to make the best use of other tunnels.

In this way, the complex tunnels were expanded by Qin Ning in the simplest way. The marching route is wider, blocking other tunnels, so you don't have to worry about the enemy suddenly appearing from a certain tunnel, which makes your own security also improved.

What the other side expects is to make contact on a small scale as much as possible, to compress the space to a minimum, and to use the most complex terrain to make up for the lack of strength.

What the Qin army should do is to do the opposite, expand the space, effectively give full play to the advantages of its own equipment, and try to simplify the complex battle situation.

Therefore, despite the suspicion of wasting time in geotechnical excavation, Qin Ning still insisted on his strategic intentions, and instead of wasting time on digging holes one by one, it was better to excavate so vigorously, widening the route of travel is not only suitable for the attack of large-scale corps, but also can effectively organize retreat in case of emergencies.

On the Northern Prince's side, he was really a little panicked, he and the black-robed envoy never expected that the various delaying methods carefully laid out would be cracked by Qin Ning so violently.

"Emissary, with the Qin army's advance speed, we can't hold out until the reinforcements arrive. The Northern Prince's voice trembled a little.

The black-robed envoy glanced at the Northern Prince fiercely, and when the Qin army dismantled the ''Sensing Alchemy Products' with great fanfare, the black-robed envoy had a bad premonition, and he was also trembling, but people like them were like this, they could lose their temper, but others couldn't. The black-robed envoy was full of disdain for the panicked appearance of the Northern Prince.

I thought about it for a moment. The black-robed envoy said, "I originally hoped that the complicated tunnel would be able to hold Qin Ning for half a month, but now it seems that it will not work. Let's use the powerful means in advance. Don't worry, there are plenty of hole cards in the tunnels. Even if Qin Ning can't be stopped, it won't be a problem to delay until the time limit. ”

Hearing what the black-robed envoy said, the Northern Prince calmed down slightly: "Ah, the envoy is so confident, then I will rest assured." But if you use the powerful means in advance, what should you do if Qin Ning breaks through?"

The black-robed envoy glared and said, "Why are you so frustrated?" The Jiuqu Labyrinth plus that big guy is enough for Qin Ning to drink a pot, and when Qin Ning takes out the Jiuqu Maze, it should be a month later." Let's use this time. Don't always think about failure, we still have a lot of hole cards. ”

After speaking, the black-robed envoy gave the Northern Prince a roll of the eyes.

The Northern Prince secretly greeted all the female relatives of the black-robed envoy, but on the surface, he still had to show a respectful appearance. The Northern Prince does not have the prestige of the former prince at all, at best, he is a follower of the black-robed envoy. All the measures were implemented, and they were all done by the Northern Prince.

According to the instructions of the black-robed envoy, the prince of the north went down and started arranging.

Doing this kind of laborious business, the resentment in the heart of the Northern Prince immediately shifted from the black-robed envoy to Qin Ning.

"Hmph, Qin Ning. No matter how good you are, I want to see how you get through the Nine Songs Labyrinth. ”

......

On Qinning's side, although the progress of geotechnical excavation is a little slow, it is one step at a time. It's very solid. As the Qin army continued to advance, small two-legged wolf squads began to appear in the tunnels to harass them.

The Qin army can remotely detect alchemy products, with the assistance of the amplifier. The detection of two-legged wolves is very accurate. Usually, the two-legged wolf squad has not yet approached the Qin army, and there are countless improved viper guide squads waiting for them.

Dig. Block, dig. Stop up......

The Qin army became more and more comfortable, carrying out the two-legged wolves that killed the team to make trouble, and the Qin army was full of nervousness from the beginning, and slowly adapted to the rhythm of the tunnel battle.

On this day, the excavation troops at the front reported to Qin Ning that a natural huge karst cave had been found in the front, which was enough to accommodate an array of troops with a scale of 200,000. At present, the forward troops have widened the tunnels and established contact with the caves.

When Qin Ning heard the news, he hurriedly asked the troops to stop, and he personally went to the front to reconnoiter on the spot.

Sure enough, in front of the tunnel dug by the Qin army, there was a huge open karst cave, the size of which was the size of a small city. This is the rock mass under some special conditions, dissolved by water to form this shape.

Qin Ning raised his eyes to look around the cave, and the countless holes on it made Qin Ning frown.

These caves should also be water-soluble caves, and the Northern Prince should have organically combined the tunnel with this cave and the small holes on the cave to form such a large-scale tunnel.

Those holes, I'm afraid, will be more tricky, because naturally formed things will not leave traces of man-made, and it will be relatively difficult to detect.

The huge cave itself is a huge threat, this large cave is equivalent to the open ground in front of the fortified city defense, and if a large army goes up, it is likely to attract a fierce blow from the opponent.

Qin Ning thought for a moment and decided to send people to investigate those small holes.

More than a dozen scout teams set off, walked through the large caves, walked into the small caves, and reconnoitred in turn.

Soon, the results of the investigation came out. Except for these small karst caves, which are winding and deep and there is no way out, nothing unusual has been found.

Qin Ning felt uneasy, and after recalling the scout team, he went deep into the small karst cave to conduct a detailed investigation.

I went ten miles deep into the small cave, but I didn't find anything. Qin Ning secretly calculated, at this distance, even if the enemy had any tricks, when the action was implemented, it would be enough for the Qin army to react.

Qin Ning decided to follow the original plan and policy, the scout team explored the passage in front, and the large troops in the back followed up, using the alchemy products of directional blasting to widen the passage, and fill all the unimportant karst caves with blasted rubble.

The scout team set off with the first batch of equipment, and after a while, the scout team sent a message to the troops behind them that they had found a specific way out, and asked the large troops behind to follow up.

One hundred thousand Qin troops immediately entered the Great Cave along the widened tunnel.

When all the 100,000 Qin troops entered the Great Cave, Qin Ning suddenly found that the solid walls of the Great Cave trembled violently.

Qin Ning immediately had a premonition that something was wrong, and shouted loudly: "Stop advancing! The rear team will change to the front team, and retreat immediately!"

As soon as the Qin army stopped and turned around, before he could retreat, the solid wall of the Great Cave burst with a bang, and dozens of swarthy cave entrances appeared in front of Qin Ning's eyes along with countless gravel.

In an instant, Qin Ning fully understood. The opponent dug in an unknown position until the edge of the large karst cave wall, leaving more than a foot of rock mass undug through. And behind the cave wall that was not dug through, heavy artillery was ambushed, so that the wall of the cave was thick enough to isolate any means of detection, and the fate of being discovered was avoided.

And when needed, as long as two heavy artillery shots, it can blast open a one-zhang thick rock mass, directly threatening one qiē within the range of the heavy artillery.

A respectful cannon muzzle emerged from the cavern that exploded, and at this time, the Qin army had only withdrawn 20,000 people!

Boom Boom Boom ......

More than a dozen heavy artillery pieces opened fire together, and heavy artillery shells fell into the dense Qin army. Suddenly, a violent explosion lifted the Qin soldiers into the sky.

A single heavy artillery shell can cause the sacrifice of thousands of Qin soldiers, and due to the bombardment of heavy artillery, the inherent retreat order of the Qin army was disrupted by Yanzhòng, and the speed of retreat was extremely slow.

Qin Ning's eyes were red, and he shouted loudly: "Don't panic, everyone, retreat in an orderly manner!"

After speaking, Qin Ning pulled out the Psychic Tyrant Knife and flew into the air.

Qin Ning found the target in mid-air, and flew into the cave with the heavy cannon in a circle, and with a flash of the psychic sword, a heavy cannon was destroyed.

Just as Qin Ning destroyed one heavy cannon after another, suddenly, a rock mass close to the ground shook like an earthquake.

Qin Ning was shocked and hurriedly accelerated the speed of destroying the heavy artillery.

Just as Qin Ning destroyed the last heavy cannon, after the sound of a landslide and a crack, a huge chariot crashed through a huge hole and drilled out of the hole.

This chariot was a rectangle, the size of four houses, and its whole body was glowing with a swarthy cold light, and the front and back of the chariot were covered with sharp blades that were as long as a kilometer. This chariot rushed forward frantically, crushing the Qin soldiers in the Great Cave.

Since the Qin army did not carry heavy firepower, in front of such a giant chariot, they could only flee in panic.

The Big Mac chariot is like the scythe of death, mercilessly reaping the lives of the soldiers of the Qin army. The damage caused by this big guy is even worse than the damage caused by heavy artillery!

Qin Ning roared, jumped high, and fell fiercely from mid-air, the psychic overlord knife in his hand burst out with brilliant light, and the incomparable sword slashed towards the huge chariot.

With a loud bang, the Psychic Blade slashed the chariot, but to Qin Ning's surprise, the chariot was undamaged under the full force of the Psychic Blade!

Qin Ning hurriedly put away the Psychic Sword, flew away, and arrived in front of the chariot. Qin Ning stretched out his arms, his hands firmly pressed against the body of the chariot, and with a stomp of his feet, the hard rocky ground suddenly sank into his knees. Qin Ning relied on this point of borrowing strength, and his arms used his divine power to push the chariot back.

When the soldiers of the Qin army saw the commander like this, they all came up to help, but they were shouted by Qin Ning: "Leave me alone, hurry up and contact the scout team in front of you to retreat!"

After listening to Qin Ning's order, all the soldiers carried out Qin Ning's order with tears in their eyes. With Qin Ning alone blocking the chariot, the Qin soldiers were able to evacuate along the way.

The crushing pressure of the chariot was getting stronger and stronger, and Qin Ning was able to hold it, but the rock mass under Qin Ning's feet couldn't hold it.

Zizizi......

Qin Ning's body sank little by little, and his legs had already submerged into the rock mass!(To be continued......) R1292