As the Americans began their own bombing runs against Omaha and Utah to the west, the Anglo-Canadian naval forces began their counter-battery fire, seeking to knock out German shore batteries and bunkers. The British had attached the cruisers and to Force J to serve as heavy support. "Belfast" commenced bombardment of the Atlantic Wall at 05:30 and "Diadem" at 05:52 on 6 June. The naval gunfire proved more effective than the aerial bombardment; the battery at Longues was the only one to return fire, and was quickly destroyed by the light cruiser . Indeed, most of the gun batteries at Juno were incomplete on D-Day, and did not possess sufficient protection or communication measures to accurately return fire on Force J. The Bény-sur-Mer battery was neutralized by "Diadem" shortly after she opened fire.