Collision problem

Hi i wanted to know how i can make my enemies collide with each other. (enemies are currently chasing me)

i have used all collisions yet its not working.

Another problem is i have a sword with a sword tag, but this sword is a child of the main character with the tag Player, how do i detect collisions with the enemy.

thanks

It depends how accurate the collision must be. You could put an enemy inside a capsule collider and make sure that it is a rigidbody.