There were actually multiple related aims achieved by D-Day. These were:
- The lodgement of a secure beachhead on the beaches of Normandy
- The linking up of the beaches from Sword Beach to Utah Beach
- Linking up with the airborne troops at Sainte-Mère-Eglise and elsewhere
- The capture of Caen
- The capture of Cherbourg
On the whole, the aims of D-Day were substantially achieved. The Allies did establish a secure foothold on the beaches and they soon linked up the entire coastline of the invasion beaches. They did also link up with the paratroopers dropped the night before and by evening they had pushed around ten kilometres inland in most areas. While Caen proved elusive, the capture of Cherbourg was achieved on June 27th, 1944.