With Ling Aocang's approval, Zhang Yunfan's tactics began to change.

The first thing that has changed is the attack effect that the planets are looking for.

In this battlefield situation, it is impossible to return to the previous situation of rejecting the enemy from being outside the attack range, so the defending planet no longer does its best to block the front and suppress the speed of the Zerg's march, but sets a large-scale anti-Zerg army as the primary goal, so that the superior firepower on the planet will not overflow due to the blockade of space.

As for the task of blocking the advance of the Zerg vanguard, it naturally fell on these heavy warships of the coalition forces.

Although the shipborne firepower of these fleets is not comparable to that of defending planets, the lethality of the Zerg at close range is enough to meet the needs of the battlefield. It doesn't require too much fire support.

As the two defending planets began to concentrate all their energy on their frontal fronts, the pressure on the Zerg attack force began to increase.

Not only that, Zhang Yunfan's second step was to change the attack situation of the coalition forces, that is, they constantly began to adjust the rotation of the planet slightly, and kept changing the attack position.

Turrets that were damaged during the Zerg attack could be moved to the back side of the planet by the rotation of the planet, where they could repair and replenish the personnel to their heart's content, so as to fully ensure that the defensive position remained in perfect condition to the greatest extent.

The fierce battle opened in this star field, and countless energy attacks came and went between the camps of the two sides, and some attacks collided between the camps, and suddenly burst out of brilliant fireworks, shaking the entire area.

The whole battle became more and more intense between the two sides, and the casualties on both sides began to skyrocket as the battlefield progressed.

The all-out force broke out on the coalition side, and the war developed into the middle of the war, and the coalition forces even transferred the two defensive planets that maintained the other end of the battle line to participate in the battle and stabilize the situation.

In order to ensure the density and intensity of the attack, the Zerg also began to arrange the entire long-range attack formation more and more densely, regardless of casualties, although the formation will make the effect of the coalition attack more prominent, but this can also ensure the increase in the density of the Zerg's own attack.

The battle between the two sides continued in this stalemate, and it was difficult to know the final winner for a while.

————————————————————

The perspective shifts to the second echelon of the coalition forces...... The fleet was now moving at breakneck speed towards the coalition's C4 defensive fortifications.

Just half an hour ago, the fleet's unmanned directional reconnaissance device spotted a large fleet of Zerg behind the fleet, apparently coming at them.

Although the fleet's scouts had not had time to find out how large this Zerg force was, they had already been discovered by the Zerg advance force and dismantled one by one. However, based on the fact that the other party dares to pursue deeply, it can be concluded that the scale of this Zerg army will not be lost to the Zerg army that attacked the first echelon.

In other words, this Zerg army also has at least 200 million troops.

As for the result of the exchange of fire between the coalition forces and such a large Zerg army, the first echelon is making real-time teaching materials for them.

Looking at the firepower coordination and position fine-tuning of those battleships and defensive planets in the battlefield projection, the commander of the second echelon knew very self-consciously that it was difficult for him or those subordinate fleets to achieve the kind of completion of the first echelon.

Now there is only one way for them to save themselves, and that is to quickly hide in the well-defended C4 fortress before the Zerg forces catch up. The reason why the Coalition Commanders used it as a rallying point for their echelons was precisely because it was already the most powerful fortress in this star field.

This road is not difficult to start with, all the second echelon has to do is to distance itself from the Zerg army, and for the coalition fleet that has always been able to crush the Zerg at speed, it should not be so difficult to complete this.

But if that's what you think, you're really wrong. You must know that the second echelon was originally going to carry out an encirclement and suppression operation, and the firepower of their fleet was even more excessive than that of the exclusive defense fleet of the Heavenly Imperial Legion, and it was precisely because of the drag of those heavy firepower that the movement speed of these super heavy fleets was very worrying.

Although the overall speed of the Zerg army is still lower than that of the second echelon, the pursuit troops they send are mostly Zerg who are good at speed, although they are not as fast as the pursuers, but there is no problem in surpassing this bulky fleet in speed.

Now, the pursuing force has completely broken away from the camp of the main force of the Zerg and has begun to slowly close the distance with the second echelon.

In fact, the number of this pursuit force of the Zerg is not large, and even if it catches up, the damage to the second echelon will not be great, but these Zerg can slow down the fleet's march, and when the main force of the Zerg approaches, the coalition forces will not have any chance to backhand.

In this case, the coalition command has already made a plan for this to the second echelon, coupled with the response made by the second army of the Ming Dynasty in the early stage when it encountered a similar situation, the second echelon did not panic because of this.

Following the previous example, the second echelon began to advance towards the target area at its highest speed, while arranging a complex of floating mines to block the pursuing forces of the Zerg, and in addition, the fleet was deliberately adjusted to prepare for firing in the rear.

However, the Zerg have a high learning ability, and of course they are also prepared for the tactics that have suffered a big loss before, and a small number of Zerg go first, hanging far in front of the pursuing troops, and take the initiative to hit the machine mine position under the second echelon.

Due to the dense arrangement of floating mines, the brilliant energy produced by the detonation of a single mine easily spread to other mines in the front, which instantly caused a large-scale detonation of floating mines in the entire area, resulting in the loss of the effectiveness of the entire mine position.

Of course, the Zerg who triggered the mine were wiped out by this energy blast, and their bones were gone, but they also fulfilled their mission with great success.

When the fierce energy fluctuations gradually calmed down, the Zerg pursuit force also arrived in this area, and the remaining small impact did not affect the overall movement of the troops at all, and the entire force rushed out of the barrier set up by the coalition forces without pause.

Next, the pursuing force used the same method to break through the three blocking positions of the coalition forces, and the front of the troops pointed directly at the fleet in front.