how to make a enemy health/die script.

I was using a gun script and i need a script that kills enemy's. if tried this script for enemy health. #pragma strict

 var Health = 100;
 
 function ApplyDammage (damage : int)
 {
     Health -= damage;
     
     if(Health <= 0)
     {
         Dead();
     }
 }
 
 function Dead()
 {
     Destroy (gameObject);
 }

ant this script for the gun

 #pragma strict
 
 var bullet : Rigidbody;
 var power : float = 1500;
 var damage : float = 100;
 var reloadtime : float = 4; // this reload time is too long!
 var magcount : int = 10;
 var magbulletcount : int = 21;
 var bulletcount : int = 0;
  
 private var reloadTimer: float = 0.0; // internal reload timer
  
 function Start () {
   bulletcount = magbulletcount;  
 }
  
 function Update(){
   if (reloadTimer > 0){ // if reloadTimer active...
     reloadTimer -= Time.deltaTime; // decrement it
     if (reloadTimer <= 0){ // if reloadTime ended...
       bulletcount = magbulletcount; // load a full clip...
       magcount--; // and decrement clip count
     }
   } 
   else // only shoot when reloadTimer not active
   if (Input.GetButtonDown("Fire1")&& bulletcount > 0){
     var instance: Rigidbody = Instantiate(bullet, transform.position, transform.rotation) as Rigidbody;
     var fwd: Vector3 = transform.TransformDirection(Vector3.forward);
     instance.AddForce(fwd * power);
     bulletcount --;
     if (bulletcount <= 0 && magcount > 0){
       // if run out of ammo but still have clips...
       reloadTimer = reloadtime; // activate reloadTimer
       // you can play reload sound or animation here
     }
   }
 }