Warfare History Network
Here's what happened.
D-Day Was Just the Beginning: The Crazy Story of Operation Cobra
Despite the infusion of massive amounts of men and materiel, the planned Allied breakout across France bogged down in Normandy, where thickly banked hedgerows or bocages provided the German defenders with excellent antitank positions. This slowing of Allied momentum helped the Germans reinforce Normandy with infantry divisions from the Werhmacht’s First and Nineteenth Armies.
On June 6, 1944 the Allies opened the Second Front against Nazi Germany. Concentrated against the beaches of Normandy, Operation Overlord landed 20 army divisions plus support troops on five beaches in anticipation of a breakout across France and toward Berlin. American forces landed on the two western beaches, Utah and Omaha, while British and Canadian troops landed farther east on beaches designated Gold, Juno, and Sword. Overall command of Allied ground forces was assigned to Field Marshal Bernard Montgomery, while Lt. Gen. Omar Bradley commanded the American Twelfth Army.