The advance was more difficulton 27 July for the American formations in the centre of the breakthrough. Armoured divisions were delayed by the density of military traffic on the roads, with columns stretching back fifteen miles or so. The obstructions were usually due to knocked-out German vehicles blocking roads. Bradley, who had foreseen these problems, had assembled 15,000 engineers for Cobra. Their main task was ‘opening and maintaining main supply routes’ through the gap. This meant filling craters in roads, clearing wrecked German vehicles and even building bypasses round towns which had been destroyed.
On 28 July, visibility was better, to the relief of American commanders. Lüttwitz’s attack with the 2nd Panzer-Division west of the River Vire was rapidly broken up by air attacks. The 116th Panzer-Division fared little better. In the west, Choltitz’s Corps was in danger of encirclement and Seventh Army headquarters ordered it to pull back towards the centre near Roncey. Obersturmbannführer Tychsen, the new commander of the Das Reich, was killed near his command post by a US reconnaissance unit. And that evening, Standartenführer Baum of the 17thSS Panzergrenadier-Division Götz von Berlichingen took command of the remnants of both divisions.
The American advance accelerated down the coast road. With the sea on their right, the 6th Armored Division advanced nearly thirty miles. Whenever they reached a road block, the air liaison officer in his tank or half-track simply called in a squadron of P-47 Thunderbolts and the defensive position would be destroyed, usually within fifteen minutes.
The Germans suffered the downward spiral of sudden retreat and smashed communications. Few commanders knew where their troops were. Divisions were fragmented and there was chaos on the roads. Ammunition and fuel supplies could not get through, so panzers and vehicles had to be abandoned. Resistance was maintained only by small groups of soldiers, with an anti-tank gun or assault gun in support. Panzer Lehr Division reported that it had ‘no forces fit for battle’. Its remnants were sent back towards Percy. On the same day, the headquarters of II Paratroop Corps reported that ‘neither light nor medium field howitzer ammunition was available’.
Heavy fighting continued near Cerisy-la-Salle in the centre, but this was really a desperate attempt by a trapped German force to fight its way out, not a last-ditch stand. American field artillery and anti-aircraft guns were ‘used to fire point-blank at the attackers’. P-47 Thunderbolts also screamed into the attack, but an unexpected sortie of Messerschmitt 109s also appeared, strafing American troops.
Part of the Kampfgruppe Heintz made its way behind hedges and avoiding villages to find a gap in the encirclement. Some of the men suggested that they should surrender, but their officers refused. ‘For five days,’ an Unteroffizier wrote, ‘we had nothing to eat but unripe fruit and the iron rations we took from our dead comrades. Once more the Army was sacrificed in order to save the SS units from being made prisoners… we had to leave behind 178 wounded.’ Surrendering was not always a safe option. An American officer with the 9th Division noted that‘when other elements of the enemy, such as Poles, tried to surrender, the SS shot them’. During the night marches to escape, morale began to deteriorate rapidly and tempers exploded. The paratroops blamed the SS for their predicament and the SS in turn blamed them. Some officers collapsed from nervous strain and exhaustion.
On the eastern side of the breakthrough in the Vire valley, the 2nd Armored Division was beyond Villebaudon, level with Tessy. Rose’s combat command was heading for Saint-Sever-Calvados, on the Villedieu-Vire road. Seventh Army headquarters suddenly feared that Choltitz’s corps in the west would be completely isolated. Choltitz received an order from Generalmajor Pemsel, the chief of staff of Seventh Army, to counter-attack towards Percy to cut off the American spearhead. Choltitz knew that this would cause chaos and expose them to fighter-bomber attacks once dawn came. It would also leave the coastal route open all the way down to Avranches. But Hausser insisted that the order be obeyed.
That evening, when Kluge at La Roche-Guyon heard of the Seventh Army’s decision to break out to the south-east, he lost his temper. He telephoned Oberstgruppenführer Hausser and ordered him to revoke the order immediately. Hausser replied that it was probably too late, but he would try. A message sent by an officer on a motorcycle finally reached Choltitz at midnight, but he had no communications with his divisions. They continued their attack towards the south-east, away from the coast.
Kluge, fearing to sack Hausser for this mistake because he belonged to the Waffen-SS, ordered that Pemsel should be replaced. General von Choltitz, who was summoned back to take over as commander of the Parisian region, was to hand over LXXXIV Corps to General Elfeldt. Hitler was also furious to hear that the road to Avranches, and thus to Brittany, lay exposed. OKW issued orders for a counter-attack immediately. Kluge demanded urgent reinforcements. He asked for the 9th Panzer-Division in the south of France and more infantry divisions. OKW accepted this request with unusual speed.
With many of the retreating German troops concentrated round Roncey, combat command B of the 2nd Armored Division started to establish blocking points along a line to the south. But during that night of 28 July, the US Army became a victim of its own profligate mechanization. Routes further north were so blocked in the breakthrough corridor that advance elements of the 4th Infantry Division’s headquarters were ‘on the road all night’. Bottlenecks were caused in each case by ‘a knocked out enemy vehicle standing partially across the road at a bad muddy spot’. Engineers could not find a way past to clear the obstacles. In one case, a staff officer commandeered a bulldozer and shifted a burnt-out vehicle himself. Some French, working furiously to help fill in craters, refused to accept any pay, insisting ‘that they did it to help us shoot more Boches’.
Major General Huebner of 1st Infantry Division, the ‘Big Red One’, was determined not to allow anything to slow his advance. He insisted that ‘only one-way traffic would prevail’ along the narrow Norman roads. Not even ambulances would be allowed to return: ‘Casualties would have to be cared for as best they could along the route of advance.’ The armoured infantry of the 3rd Armored Division climbed on to the tanks so that their half-tracks could be filled with cans of gasoline, ammunition and other supplies. The 6th Armored Division on the coast had also decided that this was no time for supply dumps or distributing rations in bivouac areas. ‘Hell, within a couple of days,’ one officer remarked, ‘we were passing out rations like Santa Claus on his sleigh, with both giver and receiver on the move.’ The Sherman crews seldom halted to cook or relieve themselves. They kept going on boiled eggs and instant coffee. A medical officer said of their pudding-basin tank helmets, ‘they crapped in them and cooked in them’. Another medical officer with the 2nd Armored Division noted an additional advantage of the rapid advance. There were very few casualties from mines and booby-traps. The Germans had had little time to leave behind any of their nasty surprises.
On 29 July, Rose’s combat command A from the 2nd Armored Division had a hard fight on the road south to Villebaudon. They came up against a Kampfgruppe of Lüttwitz’s 2nd Panzer-Division at the crossroads of La Denisière, with nearly twenty tanks and two companies of panzergrenadiers in half-tracks. Lüttwitz’s division and the newly arrived 116th Panzer-Division had been ordered to strike west to cut off the American advance, joining up with the amalgamated SS Division. But Lüttwitz perceived that this was impossible. He decided that it was more important to protect the flank along the River Vire, which was under pressure from the American 30th Infantry Division. American tank destroyers knocked out several panzers and forced the rest to withdraw eastwards to Moyon, where a much tougher battle took place.