Enemies circle around player

I am butting my head against the wall but cannot find a way to make the enemies circle around my player. Actually, I want them to maintain distance from each other and also circle around my player ( sort of hit me and get back - like in assassin's creed). If someone can help me with the code, I will be very thankful.

I already have the AI attacking me randomly but they huddle too close together.

This is a piece of code I am using to make ai decide when to attack and when to move towards me.

 if(targetalive.alive==true && lifecheck.alive==true&& !animation.IsPlaying("hit"))
 
     {
     if(distance<4&&distance>=1.5)
         {
         MoveTowards(moveToward, walkSpeed);
         animation.CrossFade("walk", 0.1);
         }
     else if (distance<30 && distance>4)
         {
         MoveTowards(moveToward, runSpeed);
         animation.CrossFade("run", 0.1);
         }
     else if (distance<1.5 && distance >=1.3)
         {
         attackRate = Random.Range(2.0,4.0);
             if(Time.time > nextAttackAllowed && !animation.IsPlaying("block"))
             {
             doNextAnim();
             timeOfLastAttack = Time.time;
             nextAttackAllowed = timeOfLastAttack + attackRate;
             }
         }
     else if (distance <1.3)    
     { 
         SlamBack (slamDirection * 1.2);
     }
 
     else
            {
            animation.CrossFade("idle", 0.1);
            }    
     }
     
     else if (lifecheck.alive==true && !animation.IsPlaying("hit"))
            {
            animation.CrossFade("idle", 0.1);
            }