diff --git a/src/engine/gameManager/BuildingManager.java b/src/engine/gameManager/BuildingManager.java
index 183855a2..92deb31e 100644
--- a/src/engine/gameManager/BuildingManager.java
+++ b/src/engine/gameManager/BuildingManager.java
@@ -51,7 +51,7 @@ public enum BuildingManager {
 
         for (int i = 1; i <= numOfSlots; i++) {
 
-            // Slot two is reserved on Arty towers for the trebuchet
+            // Slot one is reserved on Arty towers for the trebuchet
 
             if (i == 1 &&
                     building.getBlueprint() != null &&
diff --git a/src/engine/net/client/handlers/ActivateNPCMsgHandler.java b/src/engine/net/client/handlers/ActivateNPCMsgHandler.java
index f1e2532a..7aaa4d87 100644
--- a/src/engine/net/client/handlers/ActivateNPCMsgHandler.java
+++ b/src/engine/net/client/handlers/ActivateNPCMsgHandler.java
@@ -49,9 +49,12 @@ public class ActivateNPCMsgHandler extends AbstractClientMsgHandler {
 
 		for (Item hirelings : player.getInventory()) {
 			if (hirelings.getItemBase().getType().equals(ItemType.CONTRACT)) {
+
 				contract = DbManager.ContractQueries.GET_CONTRACT(hirelings.getItemBase().getUUID());
+
 				if (contract == null)
 					continue;
+
 				if (contract.canSlotinBuilding(building))
 					ItemLists.add(hirelings);
 			}
diff --git a/src/engine/objects/AbstractCharacter.java b/src/engine/objects/AbstractCharacter.java
index 372c8c6d..6535ebe4 100644
--- a/src/engine/objects/AbstractCharacter.java
+++ b/src/engine/objects/AbstractCharacter.java
@@ -117,9 +117,10 @@ public abstract class AbstractCharacter extends AbstractWorldObject {
 	private long lastHateUpdate = 0;
 	private boolean collided = false;
 	protected Regions lastRegion = null;
-	
+
 	protected boolean movingUp = false;
-	
+	public Contract contract;
+
 
 	/**
 	 * No Id Constructor
diff --git a/src/engine/objects/Contract.java b/src/engine/objects/Contract.java
index b4ed0fb9..b85a756d 100644
--- a/src/engine/objects/Contract.java
+++ b/src/engine/objects/Contract.java
@@ -254,10 +254,16 @@ public class Contract extends AbstractGameObject {
 		 if (this.allowedBuildings.size() == 0)
 			 return false;
 
+		 // Restrict arty towers to a single captain
+
+		 if (this.getContractID() == 842) // Tower Arty Captain
+			 for (AbstractCharacter hireling : building.getHirelings().keySet())
+				 if (hireling.contract.getContractID() == 842)
+					 return false;
+
 		 // Binary match
 		 return (building.getBlueprint().getBuildingGroup().elementOf(this.allowedBuildings));
-
-     }
+	 }
 
 	public int getEquipmentSet() {
 		return equipmentSet;
diff --git a/src/engine/objects/Mob.java b/src/engine/objects/Mob.java
index d7fb700e..82ffc22e 100644
--- a/src/engine/objects/Mob.java
+++ b/src/engine/objects/Mob.java
@@ -65,7 +65,6 @@ public class Mob extends AbstractIntelligenceAgent {
     public int spawnTime;
     public Zone parentZone;
     public Building building;
-    public Contract contract;
     public boolean hasLoot = false;
     public boolean isPlayerGuard = false;
     public AbstractCharacter npcOwner;
diff --git a/src/engine/objects/NPC.java b/src/engine/objects/NPC.java
index c0b5169d..760df693 100644
--- a/src/engine/objects/NPC.java
+++ b/src/engine/objects/NPC.java
@@ -52,7 +52,7 @@ public class NPC extends AbstractCharacter {
 	protected MobBase mobBase;
 	protected String name;
 	public Building building;
-	protected Contract contract;
+
 	protected int dbID;
 	protected int currentID;
 	private DateTime upgradeDateTime = null;