For 10 points, identify this amphibious assault on Normandy that opened a second front against Germany.
The Merville Gun Battery was captured in this event's Operation Tonga. Miles Dempsey led a force that advanced to Bayeux [buy-YOU] in one part of this battle, and at another location, a British force failed to capture Caen [KAHN]. Though he was away when it began,(*) Erwin Rommel planned the defenses in this battle. Fighting in it occurred at Gold Beach and Sword Beach, and Americans assaulted a heavily fortified Atlantic seawall on Omaha Beach. For 10 points, identify this amphibious assault on Normandy that opened a second front against Germany.
The Merville Gun Battery was captured in this event's Operation Tonga.
{D-Day} Invasion [or Operation {Neptune}; accept {Normandy Landings} or {Invasion of Normandy} before Normandy is mentioned, prompt on “Operation {Overlord}”]