diff --git a/Assets/Scripts/Squad.cs b/Assets/Scripts/Squad.cs
new file mode 100644
index 0000000..6af56a3
--- /dev/null
+++ b/Assets/Scripts/Squad.cs
@@ -0,0 +1,95 @@
+using UnityEngine;
+using System.Collections;
+using System.Collections.Generic;
+public class Squad : Unit 
+{
+    /// <summary>
+    /// List of non attackable units.
+    /// </summary>
+    private List<Unit> humans;
+    /// <summary>
+    /// List of attackable units.
+    /// </summary>
+    private List<Unit> soldiers;
+
+	// Use this for initialization
+	void Start () 
+    {
+        humans = new List<Unit>();
+        soldiers = new List<Unit>();
+	}
+	
+	// Update is called once per frame
+	void Update () 
+    {
+	    // TODO execute movement command
+        // TODO Check if all the units are dead
+            // if yes destroy 
+	    if (soldiers.Count == 0)
+	    {
+	        // then we destroy the squad
+            DestroyUnit();
+	    }
+	}
+
+    void addHuman(Unit humanUnit) 
+    {
+        humans.Add(humanUnit);
+    }
+
+    void addSoldier(Unit soldierUnit)
+    {
+        soldiers.Add(soldierUnit);
+    }
+
+    /// <summary>
+    ///  Dispose of a human unit and heal all the soldiers with a percentage depending 
+    ///  of the number of remaining soldiers.
+    /// </summary>
+    /// <param name="humanUnit">The human to dispose</param>
+    void healSquad(Unit humanUnit )
+    {
+       
+        var percentageOfHpToHeal = ( humanUnit.Hp / soldiers.Count );
+        
+        foreach (var soldier in soldiers)
+        {
+            soldier.Hp += soldier.Hp * ( 1 + percentageOfHpToHeal );
+        }
+
+        // dispose of the human unit
+        removeHuman(humanUnit);
+    }
+
+    /// <summary>
+    /// Abandon a specified amount of units.
+    /// </summary>
+    /// <param name="nbUnits">The number of units to abandon</param>
+    void AbandonUnits(int nbUnits)
+    {
+        humans.RemoveRange(0,nbUnits);
+    }
+
+    /// <summary>
+    /// Remove the selected soldier from the unit list.
+    /// </summary>
+    /// <param name="soldierUnit">the corresponding soldier that we want to remove</param>
+    void removeSoldier(Unit soldierUnit)
+    {
+        soldiers.Remove(soldierUnit);
+    }
+
+    /// <summary>
+    /// Remove the selected human from the human list.
+    /// </summary>
+    /// <param name="humanUnit">the corresponding human that we want to remove</param>
+    void removeHuman(Unit humanUnit)
+    {
+        humans.Remove(humanUnit);
+    }
+
+    void transformHuman()
+    {
+        
+    }
+}
diff --git a/Assets/Scripts/Squad.cs.meta b/Assets/Scripts/Squad.cs.meta
new file mode 100644
index 0000000..d852a36
--- /dev/null
+++ b/Assets/Scripts/Squad.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 03db9d7aaef4ee545971f18bb90ceadb
+timeCreated: 1439412250
+licenseType: Free
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Assets/Scripts/Unit.cs b/Assets/Scripts/Unit.cs
index b15de44..c7ffcfd 100644
--- a/Assets/Scripts/Unit.cs
+++ b/Assets/Scripts/Unit.cs
@@ -9,17 +9,17 @@ public class Unit : MonoBehaviour
     private LinkedList<Command> commandList;
     public int defaultHp = 250;
     public int defaultAttack = 100;
-    
+    private int _hp; // the unit hp
     // Use this for initialization
     void Start () 
     {
         // initialize default hp
-        //Hp = defaultHp;
+        Hp = defaultHp;
         // initialize default attack
         Attack = defaultAttack;
         // initialize default team
         // initialize default specie
-        isDead = false;
+        IsDead = false;
     }
 
     /// <summary>
@@ -41,17 +41,39 @@ public class Unit : MonoBehaviour
     /// </summary>
     protected void DestroyUnit()
     {
+        //TODO First play dead animation
+        // then destroy the game object
         Destroy(this.transform.gameObject);
     }
 
     #region Unit properties
 
-    public int Hp { get; set; }
+    public int Hp
+    {
+        get { return _hp; }
+
+        set
+        {
+            if (Hp < 0)
+            {
+                _hp = 0;
+                IsDead = true;
+            }
+            else if (value > defaultHp)
+            {
+                _hp = defaultHp;
+            }
+            else
+            {
+                _hp = value;
+            }
+        }
+    }
 
     public int Attack { get; set; }
     //public bool isAlly { get; set; }
     //public bool isHuman { get; set; }
-    public bool isDead { get; set; }
+    public bool IsDead { get; set; }
 
     public String Tag
     {
diff --git a/Assets/Scripts/VampireUnit.cs b/Assets/Scripts/VampireUnit.cs
index 8de8360..dcf5722 100644
--- a/Assets/Scripts/VampireUnit.cs
+++ b/Assets/Scripts/VampireUnit.cs
@@ -17,13 +17,13 @@ public class VampireUnit : Unit
         Attack = defaultAttack;
         // initialize default team
         // initialize default specie
-        isDead = false;
+        IsDead = false;
     }
     
     // Update is called once per frame
     void Update () 
     {
-        if (isDead)
+        if (IsDead)
         {
             // TODO play dead animation before destroying unit
             DestroyUnit();
@@ -58,17 +58,10 @@ public class VampireUnit : Unit
     void AttackEnemy(Unit unit)
     {
         //TODO improve this method to compute the reduce of hp, etc...
-        if (unit.Hp <= 0)
-        {
-            unit.isDead = true;
-        }
-        else
-        {
-            // compute the amount of hp reduced to this unit
-            unit.Hp -= Attack; // we remove some hp of the unit that was 
+        // compute the amount of hp reduced to this unit
+        unit.Hp -= Attack; // we remove some hp of the unit that was 
 
-            Debug.Log("Attacked the ennemy : " + unit.Tag);   
-        }
+        Debug.Log("Attacked the ennemy : " + unit.Tag);   
     }
 
     void OnTriggerEnter(Collider collider)
diff --git a/Assets/Scripts/ZombieUnit.cs b/Assets/Scripts/ZombieUnit.cs
index bacbdcd..0cccd59 100644
--- a/Assets/Scripts/ZombieUnit.cs
+++ b/Assets/Scripts/ZombieUnit.cs
@@ -17,13 +17,13 @@ public class ZombieUnit : Unit
         Attack = defaultAttack;
         // initialize default team
         // initialize default specie
-        isDead = false;
+        IsDead = false;
     }
 
     // Update is called once per frame
     void Update()
     {
-        if (isDead)
+        if (IsDead)
         {
             // TODO play dead animation before destroying unit
             DestroyUnit();
@@ -56,17 +56,11 @@ public class ZombieUnit : Unit
     }
     void AttackEnemy(Unit unit)
     {
-        if (unit.Hp <= 0)
-        {
-            unit.isDead = true;
-        }
-        else
-        {
-            // compute the amount of hp reduced to this unit
-            unit.Hp -= Attack; // we remove some hp of the unit that was 
+       
+        // compute the amount of hp reduced to this unit
+        unit.Hp -= Attack; // we remove some hp of the unit that was 
 
-            Debug.Log("Attacked the ennemy : " + unit.Tag);
-        }
+        Debug.Log("Attacked the ennemy : " + unit.Tag);
     }
 
     void OnTriggerEnter(Collider collider)