When the Yangtze River reaches the mouth of the sea, it is several kilometers wide and cannot be seen at a glance. Even with Zhuang Yichen's eyesight, he could only vaguely see some of the situation on the other side.

Relying on the natural barrier of the Yangtze River, the Shanghai-Nanjing-Hangzhou base area and the army of the undead began a long-lasting tug-of-war. This attrition is mainly based on air combat.

Zhuang Yichen had just stood on the roof of the building for a short time when he saw thousands of harpy banshees flying towards the opposite shore in a dense manner. Facing the overwhelming Harpy, to Zhuang Yichen's surprise, the military did not directly cover the entire sky with the overwhelming firepower net and block the Harpy's offensive route.

In fact, if you think about it carefully, this is normal, at this time, the existing four root bases of the Chinese regime rely on nuclear power and hydropower facilities, plus breakthroughs in large-capacity battery technology. Although the industrial energy problem is solved entirely by electric energy, the country's main raw material producing areas are in the occupied areas.

Oil, iron ore, copper ore, tungsten ore, rare earth. The main production areas of these important military industrial minerals are all isolated from the base areas. With raw materials extremely scarce, after several months of a long war of attrition, the military's weapons and ammunition were already stretched thin.

Without a wide range of artillery fire coverage, the harpy swarm attack rushed through the Yangtze River very smoothly and came to the military position.

Zhuang Yichen looked at it with great eyes, and saw that as soon as the harpy rushed into the river beach, the fierce melee broke out in an instant!

The army guarding the first line of defense on the river beach is an elite Evolver warrior with anti-aircraft fire on the ground. The strength of those evolutionary warriors was all above the fourth order, and even many mid-to-high-ranking officers had reached the fifth order. Dressed in composite combat uniforms and holding sharp special knives, the defenders stood guard next to the freed hoplites on the ground.

As for the Empty Hoplites, they all wore heavy metal exoskeletons with two 23mm light cannons mounted on them. Because of their slow movement, these soldiers, dressed in heavy metal exoskeletons, act like fixed fortresses, serving as the main force for emptying.

It was dark, and the short day was about to pass, so Zhuang Yichen secretly removed the building, and then moved the observation site to a high-rise building by the river that had collapsed most of its floors.

At this moment, only a sound was heard, and a series of white phosphorus incendiary bombs instantly lit up the sky on the other side of the Yangtze River. As the flares were raised, the anti-aircraft fire network made of heavy metal exoskeletons on the ground instantly erupted into angry artillery fire.

A 23mm stable tail shelling armor-piercing bullet roared in the white sky, and the brilliant firelight accurately hit the chest of the harpy, and with only one volley, the dense harpy in the sky fell to the ground like flies.

Trapped by a lack of ammunition, the warriors who wore heavy metal exoskeletons were all seasoned veterans. They opened fire as the Harpy flew close range, and with the precise firing of their six-barreled cannons, almost every shell was able to hit an enemy.

The falling Harpy immediately became the ghost of the Evolver warrior guarding the Void Fire Point. At a terrible cost, the group of harpies still relied on their super high flight speed to rush into the middle of the army. At this moment, their large, sharp claws came into play.

Generally, as long as one claw goes down, there will be a heavy air defense infantry company with a complete set of metal exoskeletons torn to pieces, and a large piece of fighting brilliance flashed, and those fourth-order evolutionary elites immediately carried their war knives and fought with the Harpy Shovel.

On the battlefield, the sound of artillery fire, shouts of killing, and roars. The brilliance of the fighting spirit covered the brilliance of the artillery fire, and even half of the river was red.

Magnificent and stunning. When Zhuang Yichen saw this, he immediately clinged to the river and flew to the other side of the Yangtze River on the edge of the chaotic battlefield.

Patches of harpy corpses fell to the ground, on the river, on the riverbank. Among them, there are many commander-level eagle body demon emperors.

After a while, Zhuang Yichen touched the beach on the other side of the Yangtze River, and the battlefield had gradually shifted to the rear of the riverbank, where there were only a large number of corpses that had not yet cooled down and the seriously injured harpy banshee who was still struggling on the ground.

When Zhuang Yichen came here, he immediately simply performed the resurrection of the dead, and a large number of harpy skeletons slowly came out of the corpse. The necromantic creatures summoned by the resurrection of the dead are much weaker than those summoned by the undead, but they can be summoned without limit.

The harpy skeletons flashed with dark red soul fire, and their bones were gray and sparse, and they could only be used as cannon fodder. However, once the quantity of cannon fodder is accumulated, it can also cause qualitative changes.

In a short time, the corpses of hundreds of harpys on the riverbank were transformed into skeleton warriors. After summoning them, Zhuang Yichen still ordered them to lie down on the ground, ambush them first, and then consider where to send them after watching the situation on the battlefield.

Soon, the artillery fire on the battlefield in the rear gradually thinned out, and the colorful fighting spirit also dimmed a lot. In front of the defenders' high and low lines, thousands of harpys were completely wiped out in a few moments. The casualties paid by the military were minimal.

At this time, a sharp dragon roar was heard again in the sky on the opposite bank, and a huge demon dragon spread its huge wings, rolled up a majestic air current, and flew towards the human army position on the other side of the Yangtze River again.

These demon dragons already belong to the higher demon dragon family, and their appearance is similar to that of the prehistoric creatures on the earth, pterodactyls, with pointed heads and two huge claws that can break gold and iron. As dragon creatures, they all have the innate ability of the dragon clan, the dragon flame breath. It's just that the dragon rock breath of these demon dragons is a long stream of dark air with a strong corrosive effect.

To deal with such a behemoth, the empty fire nets on the position are already a little inadequate. At this time, a huge roar came from the sky, and fighter jets rose into the air and met the demon dragon.

Zhuang Yichen was attracted by this sound and looked up, but a fierce air battle had already started above his head.

The number of demon dragons is about hundreds, and the reproduction rate of these high-level demon dragons is very slow, and hundreds of them have been accumulated in dozens of nests for two or three months.

The fighters flying in formation presented three groups, each with twenty-four J-6 fighters. The three groups of planes were in a zigzag shape, and the smooth fuselage slashed across the white sky, and in an instant, it was fiercely exchanged with the demon dragon.