In the battle, both the enemy and my attack order is in accordance with the squad’s combat speed.

1. The combat speed of the squad depends on factors such as heroes, soldiers, and buildings.
2. When a squad attacks, they will first use pre-battle skills, followed by Combat Skills, then normal attacks, and finally pursuit skills.

As shown in the following picture, the Pioneer with 30 combat speed on the offensive side will attack first at the beginning of the round.
He will first use the Hero's pre-battle skill, then perform Combat Skills, followed by normal attacks, and if pursuit skills are available, they will be used last.
Next attack will be from the enemy pioneer with 25 combat speed.
just like that after all six squad finish their attack, the first round will end.

3.If the combat speed is the same than the attacker will attack first.