diff --git a/server/Adjudication/Evaluation/MovementEvaluator.cs b/server/Adjudication/Evaluation/MovementEvaluator.cs
index 4b57b91..3b42992 100644
--- a/server/Adjudication/Evaluation/MovementEvaluator.cs
+++ b/server/Adjudication/Evaluation/MovementEvaluator.cs
@@ -22,11 +22,317 @@ public void EvaluateMovements()
         // - Implement adjudication algorithm
         // - Mark orders as success/failure
         // - Mark units needing retreat or add disbands if not possible (use adjacencyValidator)
+    }
+
+    public void InitialiseAdjudication()
+    {
+        foreach (var order in activeOrders)
+        {
+            order.Location.OrderAtLocation = order;
+        }
+
+        foreach (var move in activeOrders.OfType<Move>())
+        {
+            move.Destination.AttackingMoves.Add(move);
+        }
+
+        foreach (var support in activeOrders.OfType<Support>())
+        {
+            //add each support to the PotentialSupports list in the corresponding order
+            support.Midpoint.OrderAtLocation!.PotentialSupports.Add(support);
+
+            AdjudicateSupport(support);
+        }
+    }
+
+    //public void AdjudicateMoveViaConvoy(Move move)
+    //{
+    //TODO
+    //}
+
+    public void AdjudicateConvoy(Convoy convoy)
+    {
+        var unresolved = false;
+        foreach (var attackingMove in convoy.Location.AttackingMoves)
+        {
+            if (attackingMove.Status == OrderStatus.Success)
+            {
+                convoy.Status = OrderStatus.Failure;
+            }
+            else if (attackingMove.Status != OrderStatus.Failure)
+            {
+                unresolved = true;
+            }
+        }
+
+        if (!unresolved)
+        {
+            convoy.Status = OrderStatus.Success;
+        }
+    }
+
+    public void AdjudicateSupport(Support support)
+    {
+        var unresolved = false;
+        foreach (var attackingMove in support.Location.AttackingMoves)
+        {
+            if (!Object.ReferenceEquals(support.Midpoint, support.Destination) && !Object.ReferenceEquals(support.Destination, attackingMove.Location))
+            {
+                support.Status = OrderStatus.Failure;
+            }
+            else
+            {
+                unresolved = true;
+            }
+            //TODO - if AttackingMove is Move via Convoy and AttackingMove is unresolved, then unresolved = true
+        }
+
+        if (!unresolved)
+        {
+            support.Status = OrderStatus.Success;
+        }
+    }
+
+    public void AdjudicateMove(Move move)
+    {
+
+        var maxPreventStr = 0;
+        var minPreventStr = 0;
+        foreach (var attackingMove in move.Destination.AttackingMoves)
+        {
+            if (!Object.ReferenceEquals(attackingMove, move))
+            {
+                if (attackingMove.PreventStrength.Max > maxPreventStr)
+                {
+                    maxPreventStr = attackingMove.PreventStrength.Max;
+                }
+
+                if (attackingMove.PreventStrength.Min > minPreventStr)
+                {
+                    minPreventStr = attackingMove.PreventStrength.Min;
+                }
+            }
+        }
+
+        if (move.OpposingMove != null && move.AttackStrength.Min > move.OpposingMove.DefendStrength.Max || move.OpposingMove == null && move.AttackStrength.Min > move.Destination.HoldStrength.Max)
+        {
+            if (move.AttackStrength.Min > maxPreventStr)
+            {
+                move.Status = OrderStatus.Success;
+                if (move.OpposingMove != null)
+                {
+                    move.OpposingMove.Unit!.MustRetreat = true;
+                }
+                else if (move.Destination.OrderAtLocation is not null or Move)
+                {
+                    move.Destination.OrderAtLocation.Status = OrderStatus.Failure;
+                    move.Destination.OrderAtLocation.Unit!.MustRetreat = true;
+                    //This also needs to be done if the OrderAtDestination is an unsuccessful move, but that might not be determined yet.
+                    //So I'm thinking to maybe remove the MustRetreat line from here from here and calculate which units are dislodged after everything else is done.
+                }
+
+                foreach (var attackingMove in move.Destination.AttackingMoves)
+                {
+                    if (!Object.ReferenceEquals(attackingMove, move))
+                    {
+                        attackingMove.Status = OrderStatus.Failure;
+                    }
+                }
+            }
+        }
+
+        if (move.OpposingMove != null && move.AttackStrength.Max <= move.OpposingMove.DefendStrength.Min || move.OpposingMove == null && move.AttackStrength.Max <= move.Destination.HoldStrength.Min || move.AttackStrength.Max <= minPreventStr)
+        {
+            //unsuccessful
+            move.Status = OrderStatus.Failure;
+        }
+    }
+
+    public void OrderStrengthCalculator(Order order)
+    {
+        if (order is Move move)
+        {
+            MoveStrengthCalculator(move);
+        }
+        else
+        {
+            //for all other order types, we only need Hold Strength
+            //initialise to base unit strength of 1
+            order.HoldStrength.Min = 1;
+            order.HoldStrength.Max = 1;
+            foreach (var support in order.PotentialSupports)
+            {
+                //all successful supports add 1 to min and max, all unresolved add 1 to max.
+                if (support.Status == OrderStatus.Success)
+                {
+                    order.HoldStrength.Max += 1;
+                    order.HoldStrength.Min += 1;
+                }
+                else if (support.Status != OrderStatus.Failure)
+                {
+                    order.HoldStrength.Max += 1;
+                }
+            }
+            //copy over HoldStrength to the Location, as this makes adjudication more simple
+            order.Location.HoldStrength.Min = order.HoldStrength.Min;
+            order.Location.HoldStrength.Max = order.HoldStrength.Max;
+        }
+    }
+
+    public void MoveStrengthCalculator(Move move)
+    {
+        //initialise all strengths to the base strength of the unit
+        move.AttackStrength.Min = 1;
+        move.AttackStrength.Max = 1;
+        move.HoldStrength.Min = 1;
+        move.HoldStrength.Max = 1;
+        move.DefendStrength.Min = 1;
+        move.DefendStrength.Max = 1;
+        move.PreventStrength.Min = 1;
+        move.PreventStrength.Max = 1;
+        //Hold Strength
+        if (move.Status == OrderStatus.Success)
+        {
+            //if a move is successful, its hold strength is 0
+            move.HoldStrength.Min = 0;
+            move.HoldStrength.Max = 0;
+        }
+        else if (move.Status == OrderStatus.Failure)
+        {
+            //if a move fails, its hold strength is 1
+            move.HoldStrength.Min = 1;
+            move.HoldStrength.Max = 1;
+        }
+        else
+        {
+            //if unknown resolution, could be 0 or 1
+            move.HoldStrength.Min = 0;
+            move.HoldStrength.Max = 1;
+        }
+        //copy over HoldStrength to the Location, as this makes adjudication more simple
+        move.Location.HoldStrength.Min = move.HoldStrength.Min;
+        move.Location.HoldStrength.Max = move.HoldStrength.Max;
+
+        //Attack Strength
+        //TODO - this still needs convoy logic. If the move is via convoy the min strength is always 0 until a Successful path is determined.
+        var minAttackStrengthSet = false;
+        var maxAttackStrengthSet = false;
+        if (move.Destination.OrderAtLocation != null && move.Unit!.Owner == move.Destination.OrderAtLocation.Unit!.Owner)
+        {
+            if (move.Destination.OrderAtLocation is Move)
+            {
+                if (move.Destination.OrderAtLocation.Status == OrderStatus.Failure)
+                {
+                    //if the unit at the destination belongs to the same country and is moving, the attack strength is 0 if that unit fails to move.
+                    move.AttackStrength.Min = 0;
+                    move.AttackStrength.Max = 0;
+                    minAttackStrengthSet = true;
+                    maxAttackStrengthSet = true;
+                }
+                else if (move.Destination.OrderAtLocation.Status != OrderStatus.Success)
+                {
+                    //if that destination move is unresolved, then the min attack strength is the case where it fails.
+                    move.AttackStrength.Min = 0;
+                    minAttackStrengthSet = true;
+                }
+            }
+            else
+            {
+                //if the unit at the destination belongs to the same country and is not moving, the attack strength is always 0.
+                move.AttackStrength.Min = 0;
+                move.AttackStrength.Max = 0;
+                minAttackStrengthSet = true;
+                maxAttackStrengthSet = true;
+            }
+        }
+
+        if (!maxAttackStrengthSet)
+        {
+            foreach (var support in move.PotentialSupports)
+            {
+                if (move.Destination.OrderAtLocation == null || support.Unit!.Owner != move.Destination.OrderAtLocation.Unit!.Owner || move.Destination.OrderAtLocation.Status == OrderStatus.Success)
+                {
+                    //a support will not add to the attack strength if it belongs to the same country as the unit at the destination, unless that destination move was successful
+                    //otherwise all successful supports add to the min and max str, and all unresolved supports add to the max str (where min and max have not been set to 0 previously).
+                    if (support.Status == OrderStatus.Success)
+                    {
+                        move.AttackStrength.Max += 1;
+                        if (!minAttackStrengthSet)
+                        {
+                            move.AttackStrength.Min += 1;
+                        }
+                    }
+                    else if (support.Status != OrderStatus.Failure)
+                    {
+                        move.AttackStrength.Max += 1;
+                    }
+                }
+                else if (move.Destination.OrderAtLocation.Status != OrderStatus.Failure)
+                {
+                    //if that destination move is unresolved, then a support belonging to the same country can be counted, but only for max strength.
+                    if (support.Status != OrderStatus.Failure)
+                    {
+                        move.AttackStrength.Max += 1;
+                    }
+                }
+            }
+        }
+        //Defend Strength
+        foreach (var support in move.PotentialSupports)
+        {
+            //all successful supports add 1 to min and max, all unresolved add 1 to max.
+            if (support.Status == OrderStatus.Success)
+            {
+                move.DefendStrength.Max += 1;
+                move.DefendStrength.Min += 1;
+            }
+            else if (support.Status != OrderStatus.Failure)
+            {
+                move.DefendStrength.Max += 1;
+            }
+        }
+
+        //Prevent Strength
+        //TODO - this also still needs convoy logic. Will be same as Attack Strength.
+        var minPreventStrengthSet = false;
+        var maxPreventStrengthSet = false;
+        if (move.OpposingMove != null)
+        {
+            if (move.OpposingMove.Status == OrderStatus.Success)
+            {
+                //if the head to head attacker is successful, a move order has no attack strength
+                move.PreventStrength.Min = 0;
+                move.PreventStrength.Max = 0;
+                minPreventStrengthSet = true;
+                maxPreventStrengthSet = true;
+            }
+            else if (move.OpposingMove.Status != OrderStatus.Failure)
+            {
+                //head to head attacker has not yet been resolved, so minimum value is the case where the head to head attacker is successful
+                move.PreventStrength.Min = 0;
+                minPreventStrengthSet = true;
+            }
+        }
 
-        // TEMP
-        foreach (var order in activeOrders.Where(o => o.Status != OrderStatus.Invalid && o.Location.Phase != Phase.Winter))
+        if (!maxPreventStrengthSet)
         {
-            order.Status = OrderStatus.Success;
+            foreach (var support in move.PotentialSupports)
+            {
+                //Min Prevent Str is 1 + number of successful supports, if not already set to 0.
+                //Max Prevent Str is 1 + number of successful or unresolved supports, if not already set to 0.
+                if (support.Status == OrderStatus.Success)
+                {
+                    move.AttackStrength.Max += 1;
+                    if (!minPreventStrengthSet)
+                    {
+                        move.PreventStrength.Min += 1;
+                    }
+                }
+                else if (support.Status != OrderStatus.Failure)
+                {
+                    move.PreventStrength.Max += 1;
+                }
+            }
         }
     }
 }
diff --git a/server/Entities/Location.cs b/server/Entities/Location.cs
index a2f3276..451689c 100644
--- a/server/Entities/Location.cs
+++ b/server/Entities/Location.cs
@@ -24,4 +24,13 @@ public bool Equals(Location? other)
     public override bool Equals(object? obj) => Equals(obj as Location);
 
     public override int GetHashCode() => (Timeline, Year, Phase, RegionId).GetHashCode();
+
+    [NotMapped]
+    public List<Move> AttackingMoves { get; set; } = [];
+
+    [NotMapped]
+    public OrderStrength HoldStrength { get; set; } = new();
+
+    [NotMapped]
+    public virtual Order? OrderAtLocation { get; set; }
 }
diff --git a/server/Entities/Orders/Order.cs b/server/Entities/Orders/Order.cs
index d6b4dac..5a53bf1 100644
--- a/server/Entities/Orders/Order.cs
+++ b/server/Entities/Orders/Order.cs
@@ -23,4 +23,7 @@ public abstract class Order
 
     [NotMapped]
     public OrderStrength HoldStrength { get; set; } = new();
+
+    [NotMapped]
+    public List<Support> PotentialSupports { get; set; } = [];
 }