StopCoroutine not working.

I want to instantiate while the coroutine is running, then when the coroutine stops running it should stop instantiating the gameobject. But it continues to instantiate them even after I call StopCoroutine. Any thoughts on why this is happening? Am I using StopCoroutine correctly?

     public IEnumerator Attack1()
     {
         //Smash Right
         Instantiate(damageZoneGoRightLong, new Vector3(transform.localPosition.x + 4, -5.25f, 1), transform.rotation);
         yield return new WaitForSeconds(1);
         StartCoroutine(Attack2());
         StopCoroutine(Attack1());
     }
     public IEnumerator Attack2()
     {
         //Swipe Left
         Instantiate(damageZoneGoLeft, new Vector3(transform.position.x, -5.25f, 1), transform.rotation);
         yield return new WaitForSeconds(3.5f);
         StartCoroutine(Attack3());
         StopCoroutine(Attack2());
     }