diff --git a/game-app/game-core/src/main/java/games/strategy/engine/data/ResourceCollection.java b/game-app/game-core/src/main/java/games/strategy/engine/data/ResourceCollection.java
index fa81b8cec7f..8e709ccae93 100644
--- a/game-app/game-core/src/main/java/games/strategy/engine/data/ResourceCollection.java
+++ b/game-app/game-core/src/main/java/games/strategy/engine/data/ResourceCollection.java
@@ -50,7 +50,7 @@ public void removeResource(final Resource resource, final int quantity) {
     final int current = getQuantity(resource);
     if ((current - quantity) < 0) {
       throw new IllegalArgumentException(
-          "Cant remove more than player has of resource: "
+          "Can't remove more than player has of resource: "
               + resource.getName()
               + ". current:"
               + current
@@ -60,10 +60,6 @@ public void removeResource(final Resource resource, final int quantity) {
     change(resource, -quantity);
   }
 
-  public void removeAllOfResource(final Resource resource) {
-    resources.removeKey(resource);
-  }
-
   private void change(final Resource resource, final int quantity) {
     resources.add(resource, quantity);
   }
diff --git a/game-app/game-core/src/main/java/games/strategy/engine/history/History.java b/game-app/game-core/src/main/java/games/strategy/engine/history/History.java
index 1ebfbaa79af..145ef588410 100644
--- a/game-app/game-core/src/main/java/games/strategy/engine/history/History.java
+++ b/game-app/game-core/src/main/java/games/strategy/engine/history/History.java
@@ -88,7 +88,7 @@ private int getLastChange(final HistoryNode node) {
     } else if (node instanceof EventChild) {
       lastChangeIndex = ((Event) node.getParent()).getChangeEndIndex();
     } else if (node instanceof IndexedHistoryNode) {
-      lastChangeIndex = ((IndexedHistoryNode) node).getChangeStartIndex();
+      lastChangeIndex = ((IndexedHistoryNode) node).getChangeEndIndex();
     } else {
       lastChangeIndex = 0;
     }
@@ -114,7 +114,7 @@ public Change getDelta(final HistoryNode start, final HistoryNode end) {
   /** Changes the game state to reflect the historical state at {@code node}. */
   public synchronized void gotoNode(final HistoryNode node) {
     assertCorrectThread();
-    getGameData().acquireWriteLock();
+    gameData.acquireWriteLock();
     try {
       if (currentNode == null) {
         currentNode = getLastNode();
@@ -125,7 +125,7 @@ public synchronized void gotoNode(final HistoryNode node) {
         gameData.performChange(dataChange);
       }
     } finally {
-      getGameData().releaseWriteLock();
+      gameData.releaseWriteLock();
     }
   }
 
@@ -136,7 +136,7 @@ public synchronized void gotoNode(final HistoryNode node) {
   public synchronized void removeAllHistoryAfterNode(final HistoryNode removeAfterNode) {
     gotoNode(removeAfterNode);
     assertCorrectThread();
-    getGameData().acquireWriteLock();
+    gameData.acquireWriteLock();
     try {
       final int lastChange = getLastChange(removeAfterNode) + 1;
       while (changes.size() > lastChange) {
@@ -163,7 +163,7 @@ public synchronized void removeAllHistoryAfterNode(final HistoryNode removeAfter
         this.removeNodeFromParent(nodesToRemove.remove(0));
       }
     } finally {
-      getGameData().releaseWriteLock();
+      gameData.releaseWriteLock();
     }
   }