Bocage

The French Bocage or "hedgerow" was a huge disadvantage for the Allies.  When preparing for advancement through this area of France the Allies did not expect the Bocage to be as impeding as they were.  Essentially they were killing traps where the Germans could prepare for the unsuspecting Allies coming through the high walls.  Getting through the thick tall walls and deep roots was only their first difficulty.  Once through they had to be ready for the well rested and prepared opponents waiting for them.  It took the Allies time to find a good way to do this, and in many cases it required Sherman Tanks with white phosphorous.  

This important aspect of the war helped the Allies progress with better strategies.  A disadvantge like this made them think and prepare more for each fight.  Most importantly it was the men on the field that had to think for their survival.  This was something new for them, and it made them better and stronger soldiers.  Could the Bocage have been an advantage as much as it was a disadvantage for the Allies' troops?