enemy ai not losing health

1. i imported a 3d model from makehuman to unity3d with help of blender and i apllied enemy's health script to that model because i want him as a enemy ai and the model does not have any collider attached so i tried different collider but he still does not lose health . here are the enemys'health script
2. #pragma strict
   var Health = 100;
   function Update ()
   {
   if(Health <= 0)
   {
   Dead();
   }
   }
   function ApplyDammage (TheDammage : int)
   {
   Health = Health - TheDammage;
   }
   function Dead()
   {
   Destroy (gameObject);
   }
   
   
3. and here are the melee script
4. #pragma strict
   var TheDammage : int = 50;
   var Distance : float;
   var MaxDistance : float = 1.5f;
   var TheMace : Transform;
   
   function Update (){
   
   if(Input.GetButtonDown("fire1")){
   //attackAnimation
   
   TheMace.GetComponent(Animation).Play("attack");
   //attack function
   AttackDammage();
   }
   }
   function AttackDammage ()
   {
   //Attack function
   var hit : RaycastHit;
   if (Physics.Raycast (TheMace.transform.position,TheMace.transform.TransformDirection(Vector3.forward), hit))
   {
   if(hit.distance < MaxDistance)
   {
   hit.transform.SendMessage("ApplyDammage", TheDammage, SendMessageOptions.DontRequireReceiver);
   }
   }
   if (Input.GetKey (KeyCode.LeftShift))
   {
   TheMace.GetComponent(Animation).CrossFade("Sprint");
   }
   }

 

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sorry iam new to this thread so dont know how to post