 Complete the following phrase:  The 224th Field Ambulance was converted to an airborne unit in 1942, and assigned to the 3rd Parachute Brigade, part of the 6th Airborne Division. They first saw active service in 1944 during the invasion of Normandy, and remained in France until September. They were then withdrawn back to England only to return to the continent at the end of the year in response to the German surprise 