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When the zombie horde launched a charge against the Steel Keep, the zombie horde's siege equipment was also launched at the same time, with more than half a hundred huge stones and hundreds of huge siege crossbow arrows as thick as human arms approaching the walls of the Steel Citadel from far and near.

"Bang ......"

Boulders and siege bolts fell, many hitting the walls of the Iron Citadel with a loud crash.

However, the scene where the corpse general expected the wall to be destroyed did not appear.

Under the action of great inertia, the boulders that smashed on the walls of the Iron Castle were smashed to pieces. However, the walls of the Iron Citadel remained unmoved.

The corpses hiding in the trenches of the position will be clearly visible, and the walls of the Iron Citadel will be only a few corners and corners at most knocked out by the boulders.

You must know that because of the construction of the big city wall around the heart of the river, the west wall of the steel fortress has now been built on the basis of the original city wall, and a reinforced concrete city wall with a thickness of 6 meters and a height of 12 meters has been set outside, with a total thickness of 11 meters.

Not only is the texture of the materials used better than the boulders that the zombies hastily found. And it also added Chen Shuyuan's strengthening. How can the boulder collected by the zombies be smashed? What's more, many of them are actually the ruins of the zombies collected from nearby villages, and these things are meant to be broken at the touch of a button.

And the zombies' siege bolts, although some of them are inserted into the walls of the Iron Fortress. But the depth was very low, and even the battlements of the city wall, which were less than half a meter thick, could not be penetrated.

In fact, there are very few that can be inserted into the wall of the city wall 10 centimeters deep.

There are many, even just a "dang", knocking off a small piece of concrete on the city wall, and then it falls into the Nenjiang River and disappears into the surging river.

There is no way to achieve the same power of each siege crossbow in the zombie craft. It's normal to have some lack of strength. But the walls of the Iron Fortress remained the same.

This result made the corpse general very unhappy, and it realized that this time they had encountered a hard bone. But of course, it won't give up on attacking so easily.

So with a roar, it ordered the siege equipment troops to hurry up and continue the attack.

However, the troops of the Self-Salvation Army are not soft persimmons to be pinched.

The attack of the zombie horde just now has completely exposed the location of their siege equipment positions. (Although it was night, with the help of night vision devices and lights, the SPA troops could easily find the location where the boulder was launched.) ）

So the mortar unit quickly entered the position, and in less than half a minute, the angle of the shelling was adjusted.

"Put!"

More than 80 mortars attacked at the same time.

"Boom ......"

In the blink of an eye, an explosion sounded in the woods on the opposite bank.

The dense firelight was connected, and a large number of zombie siege equipment was blown up along with the zombies operating them.

However, a number of boulders and siege bolts were shot out in the firelight, flying towards the walls of the Iron Keep.

And this time the Boulder and Siege Bolts seem to be slightly more effective than the first time.

The reason is simple, the earth-based abilities cast by Chen Shuyuan on the city wall will be consumed with the zombie's attack. The force of the throwing stone is not weak.

It's just that zombies want to use up these abilities completely, but it's not that fast. The total amount of abilities that Chen Shuyuan has applied on the city wall for several months in a row is quite large.

At the same time, the infantry of the zombie group had rushed to the bank of the Nenjiang River in a very short period of time. Some of the zombies rushed directly onto the stone bridge leading to the Iron Castle and headed straight for the city gate.

The stone bridge is currently the only way in and out of the Iron Fortress.

However, in the direction of the city gate, there is another section of the suspension bridge, about 12 meters long, which has been closed by this time. As high as the city walls. So even if the zombies rush to the bridge, they can't get over.

Unless they can fill in this stretch of water!

This is also the reason why Wei Chen and Zhang Fatzi guessed before, the zombies did not only hold a stone to charge.

If necessary, the corpse will even use the corpse to fill in a path for the troops behind.

So within two clicks, the stone bridge was already densely packed with zombies.

There were many more zombies who couldn't make it to the stone bridge, and they began to systematically fill the river with rocks along the upper reaches of the stone bridge.

Although there are as many as 100,000 zombies, it is impossible to rely on each zombie to bring a stone and fill the entire Nenjiang River in full bloom.

Therefore, the corpse will concentrate its forces on filling in the stones within 50 meters of the stone bridge upstream.

The effect of this is really significant, a large number of zombies are concentrated here, and the zombies who drop the stones retreat. The zombies behind them continued to throw rocks forward.

"Puff puff ......"

The stones smashed into the river like raindrops, splashing countless splashes, and in just one minute, the part of the Nenjiang River near the shallows had been filled up for more than ten meters. Of course, this is also related to the fact that the water in the previous section is not deep, and the further you go to the center of the Nenjiang River, the more rocks need to be filled, and the speed will naturally slow down. And the shortest surface of this section of the Nenjiang River is 500 meters! It will take a long time to actually fill under the walls of the Iron Castle.

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"Quick! Get into position"

The combat troops of the Self-Salvation Army had already been ready behind the city wall, and when they saw that the zombie group had rushed onto the stone bridge, they took action and ran up the city wall to prepare for battle.

"Da Da ......"

Gunshots soon rang out, and a dense stream of bullets poured down from the city walls and aimed at the zombies on the stone bridge.

Under the powerful firepower of the Self-Rescue Army, the zombie group in the rapid charge stopped in an instant as if it had hit a solid wall.

Patches of zombies were beaten into a sieve and kept falling. But more is still on the way.

Only in this way can the zombie group continue to advance slowly and reluctantly under the powerful firepower of the self-rescue army. Almost every meter they advance costs a huge price. At this time, they were still nearly 150 meters away from reaching the bridgehead.

Within 5 minutes, the zombie horde on the stone bridge finally advanced a distance of 50 meters. And in the process, more than 3,000 zombies fell on the way forward. The bridge deck that was trampled by zombies was covered with a thick layer of zombie corpses, and there were an average of 60 zombies per meter on the bridge deck less than ten meters wide.

The archers on the zombie side had also begun to attack at this time, trying to use their arrows to interfere with the shooting of the self-rescue troops on the city wall.

However, the number of bows and arrows shot from the zombie hordes is really small.

There weren't many zombies on the narrow bridge deck, and the firepower was much weaker than the firepower on the city wall of the Self-Rescue Army, and it didn't play much of a harassing role at all.

Therefore, the zombie horde can only move forward slowly.

And on the riverside behind them, the main force of the zombie group was still filling the river with stones, and at this time it had advanced a distance of nearly 50 meters.

But they were also under heavy bombardment by the mortar units of the Self-Salvation Army. As for the siege equipment of the zombie herd, it has long been wiped out by the mortar units of the self-rescue army.

And their contributions, except for throwing a lot of huge stones into the Nenjiang River, reducing the workload for the follow-up zombies to fill the Nenjiang River, there is almost no other gain. The fortification of the walls of the Iron Fortress is mediocre.