Bradley was also encouraged by aerial photographs showing that behind the German lines the roads were empty. Behind American lines the roads were nose-to-tail armour, transport convoys, and troops. Huge supply dumps dotted the fields, with no need for camouflage. These were among the fruits of air superiority.
The Ninth Tactical Air Force had a dozen airstrips in Normandy by this time. Pilots could be over their targets in a matter of minutes. They were daredevil youngsters, some of them only nineteen years of age. (It was generally felt that by the time he reached his mid-twenties, a man was too sensible to take the chances required of a P-47 pilot.) They made up to five sorties per day. They dominated the sky and brought destruction to the Germans below.
Another plus for Bradley: his men were tactically much better equipped than they had been when the campaign began. By July 24 three of five First Army tanks had been fitted with a rhino. Ground-air communications were improving daily. Bradley had ruthlessly relieved incompetent division commanders. The frontline soldiers were a mix of veterans and replacements, with relatively good morale, although, like the Germans, badly worn down.
First Army had reached the limits of the worst of the hedgerows. Beyond lay rolling countryside. Roads were more numerous; many were tarred; a few were even four-lane. The front line ran close to the St. Lo-Periers road, which was an east-west paved highway, the N-800. Here the Panzer Lehr Division held the line for the Germans. Facing them were the American 9th, 4th, and 30th divisions.
Bradley decided he could use the St. Lo-Periers road as a marker for the strategic air forces and lay a carpet of bombs on Panzer Lehr by having the bombers fly parallel to the road-a landmark they couldn’t miss. The area to be obliterated was six kilometres along the road and two kilometres south of it. Massed artillery would come after the bombardment, followed by a tank-infantry assault three divisions strong. If it worked, the Americans would break out of the hedgerow country and uncover the entire German left wing in Normandy, with Patton’s Third Army ready to come in and exploit a breakthrough. Bradley gave the operation the code name Cobra.
On July 24 the weather appeared acceptable, and an order to go went out to the airfields, only to be rescinded after a third of the bombers had taken off. By the time the recall signal had gone out, one flight of B-17s had crossed the coast and released its load of 500-pound bombs through cloud cover. Most of the bombs fell short, causing casualties in the American 30th Division and leaving the infantrymen madder than hell.
Worse, the bombers had come in perpendicular to the line, not parallel. The airmen argued that they couldn’t funnel all the bombers through the narrow corridor created by using a single marker. It would take hours for them to pass over the target-all the time exposed to antiaircraft fire from the 88s. By coming in perpendicular, spread out, the bombers would only be taking flak during the seconds it took to cross the line and jdrop the bombs. Bradley still wanted a parallel approach, but the airmen convinced him that it was too late to change the plan.
July 25 was clear. At 0938 some 550 fighter-bombers were guided in by radio messages from air controllers riding in tanks at the head of armoured columns. P-47s fired rockets and machine guns on German positions just south of the road and dropped 500-pound bombs that could be placed within 300 metres of the American lines.
Reporter Ernie Pyle wrote, “The dive bombers hit it just right. We stood in the barnyard of a French farm and watched them barrel nearly straight down out of the sky. They were bombing less than a half-a-mile ahead of where we stood. They came in groups, diving from every direction, perfectly timed, one after another.”
After twenty minutes the P-47s gave way to 1,800 B-17s. Their appearance left men groping for words to describe it. Pyle did it this way: “A new sound gradually droned into our ears-a gigantic faraway surge of doomlike sound. It was the heavies. They came on in flights of twelve, three flights to a group and in groups stretched out across the sky. Their march across the sky was slow and studied. I’ve never known anything that had about it the aura of such a ghastly relentlessness.”