What is the best way to manage the attack and auto-attack animation per second when the object collides?,Best way to make 2 objects attack per time each other when colide?

I have two objects that are invoked when the scene starts (one on the left side and one on the right side of the screen) that automatically walk to the center. When they meet, the attack animation plays and damage is dealt to the enemy. What is the best way to perform this action having to control the animation and the damage of the attack to execute every x seconds?