diff --git a/src/ch/zhaw/catan/Player.java b/src/ch/zhaw/catan/Player.java
index 2011fe8..1af8d51 100644
--- a/src/ch/zhaw/catan/Player.java
+++ b/src/ch/zhaw/catan/Player.java
@@ -1,5 +1,6 @@
 package ch.zhaw.catan;
 
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 
@@ -54,8 +55,12 @@ public class Player {
      * @param resource to add
      * @param numberToAdd how much to add
      */
-    public void addResource(Config.Resource resource, int numberToAdd) {
-        resources.put(resource, resources.get(resource) + numberToAdd);
+    public boolean addResource(Config.Resource resource, int numberToAdd, Bank bank) {
+        if(bank.getResourceFromBank(resource, numberToAdd)){
+            resources.put(resource, resources.get(resource) + numberToAdd);
+            return true;
+        }
+        return false;
     }
 
     /**
@@ -64,12 +69,18 @@ public class Player {
      * @param numberToTake how much to substract
      * @return true if resource has been substracted false if player has not enough resources
      */
-    public boolean substractResource(Config.Resource resource, int numberToTake) {
+    public boolean substractResource(Config.Resource resource, int numberToTake, Bank bank) {
         int inPossesion = resources.get(resource);
         if(inPossesion - numberToTake < 0) {
             return false;
         }
         resources.put(resource,inPossesion - numberToTake);
+        ArrayList<Config.Resource> resourcesForBank = new ArrayList<>();
+        for(int i = 0; i < numberToTake; i++){
+            resourcesForBank.add(resource);
+        }
+        bank.storeResourceToBank(resourcesForBank);
+
         return true;
     }
 
@@ -79,13 +90,13 @@ public class Player {
      * in possesion by the player.
      * @return true if road can be created false if road can't be created
      */
-    public boolean buildRoad() {
+    public boolean buildRoad(Bank bank) {
         List<Config.Resource> costs = Config.Structure.ROAD.getCosts();
         if ( roadsToUse == 0 || !checkRessourceToBuild(costs)) {
             return false;
         }
         for (Config.Resource resource : costs) {
-            resources.put(resource,resources.get(resource)-1);
+            substractResource(resource, 1, bank);
         }
         return true;
     }
@@ -96,13 +107,13 @@ public class Player {
      * in possession by the player.
      * @return true if road can be created false if road can't be created.
      */
-    public boolean buildSettlement() {
+    public boolean buildSettlement(Bank bank) {
         List<Config.Resource> costs = Config.Structure.SETTLEMENT.getCosts();
         if ( settlementsToUse == 0 || !checkRessourceToBuild(costs)) {
             return false;
         }
         for (Config.Resource resource : costs) {
-            resources.put(resource,resources.get(resource)-1);
+            substractResource(resource, 1, bank);
         }
         return true;
     }
@@ -113,13 +124,13 @@ public class Player {
      * the buildcost from the resources in possession by the player.
      * @return true if road can be created false if road can't be created.
      */
-    public boolean buildCity() {
+    public boolean buildCity(Bank bank) {
         List<Config.Resource> costs = Config.Structure.CITY.getCosts();
         if ( citiesToUse == 0 || !checkRessourceToBuild(costs)){
             return false;
         }
         for (Config.Resource resource : costs){
-            resources.put(resource,resources.get(resource)-1);
+            substractResource(resource, 1, bank);
         }
         return true;
     }
diff --git a/src/ch/zhaw/catan/SiedlerGame.java b/src/ch/zhaw/catan/SiedlerGame.java
index e25bd00..2366058 100644
--- a/src/ch/zhaw/catan/SiedlerGame.java
+++ b/src/ch/zhaw/catan/SiedlerGame.java
@@ -156,7 +156,7 @@ public class SiedlerGame {
             List<Config.Land> lands = board.getLandsForCorner(position);
             for (Config.Land land : lands) {
                 if (land.getResource() != null) {
-                    allPlayers.get(activePlayer).addResource(land.getResource(), 1);
+                    allPlayers.get(activePlayer).addResource(land.getResource(), 1, bank);
                 }
             }
         }
@@ -214,7 +214,7 @@ public class SiedlerGame {
                     for (Config.Resource resource : resources){
                         //TODO: Check if Resource Null notwendig?
                         returnMap.get(player.getFaction()).add(resource);
-                        player.addResource(resource,1);
+                        player.addResource(resource,1, bank);
                     }
                 }
             }
@@ -263,13 +263,11 @@ public class SiedlerGame {
             return false;
         }
         //3. Can Player build Settlement
-        if (!allPlayers.get(activePlayer).buildSettlement()) {
+        if (!allPlayers.get(activePlayer).buildSettlement(bank)) {
             return false;
         }
         //4. Insert Settlement to map
         board.setCorner(position, new Settlement(allPlayers.get(activePlayer).getFaction()));
-        //5. Give Resources to bank
-        bank.storeResourceToBank(Config.Structure.SETTLEMENT.getCosts());
         return true;
     }
 
@@ -298,13 +296,11 @@ public class SiedlerGame {
             return false;
         }
         //3. Can player build a City.
-        if(!allPlayers.get(activePlayer).buildCity()){
+        if(!allPlayers.get(activePlayer).buildCity(bank)){
             return false;
         }
         //4.Insert City into the map.
         board.setCorner(position,new City(allPlayers.get(activePlayer).getFaction()));
-        //5. Give resources to the bank.
-        bank.storeResourceToBank(Config.Structure.CITY.getCosts());
         return false;
     }
 
@@ -328,14 +324,12 @@ public class SiedlerGame {
             return false;
         }
         //2. Can Player build road
-        if (!allPlayers.get(activePlayer).buildRoad()) {
+        if (!allPlayers.get(activePlayer).buildRoad(bank)) {
             // TODO: Error message
             return false;
         }
         //3. Insert Road to map
         board.setEdge(roadStart, roadEnd, new Road(allPlayers.get(activePlayer).getFaction()));
-        //4. Give Resource to bank
-        bank.storeResourceToBank(Config.Structure.ROAD.getCosts());
         return true;
     }
 
@@ -443,7 +437,12 @@ public class SiedlerGame {
      * @return true, if the trade was successful
      */
     public boolean tradeWithBankFourToOne(Resource offer, Resource want) {
-        return bank.tradeWithBank(want, offer, FOUR_TO_ONE_TRADE_WANT, FOUR_TO_ONE_TRADE_OFFER);
+        Player player = allPlayers.get(activePlayer);
+         if(player.getSpecificResource(offer) >= FOUR_TO_ONE_TRADE_OFFER && player.addResource(want, FOUR_TO_ONE_TRADE_WANT, bank)){
+             player.substractResource(offer, FOUR_TO_ONE_TRADE_OFFER, bank);
+             return true;
+         }
+         return false;
     }
 
     /**