Revealed: How archaeologists are shedding new light on how Hitler was defeated

Operation Cobra was arguably the most successful allied western European military land operation of the Second World War

German Field Marshal Von Kluge (pictured, left, with Hitler earlier in the war) knew about the plan to kill the Nazi leader (Deutsches Bundesarchiv)

A British archaeological investigation is revealing the true story of one of the Second World War’s most important battles.

Known as Operation Cobra, the crucial yet little-researched series of engagements took place in late July 1944 (just 51 days after the Normandy landings) – and was arguably the most successful allied western European military land operation of the entire war.

The excavation project in Normandy is one of the largest archaeological investigations, into a Second World War battlefield, ever carried out.

US tanks pass through the wrecked streets of the Normandy town of Coutances during Operation Cobra (US National Archives)

Discoveries being made by the archaeologists are revealing the scale of the allied victory – and the sheer scale of the disaster that befell the Germans.

But by doing that, the excavations are also highlighting the extraordinary political dilemma that German commanders in France faced following D-Day.

Adolf Hitler’s interference in German military decision-making (and his frequent rejection of military advice) had already allowed the Allies to successfully re-enforce their Normandy beachhead in the days following D-Day.

The German commanders knew that their position in post-D-Day Normandy was untenable - and yet, because of pressure from Hitler, they failed to do the only thing that might have bought them time, namely a tactical retreat to pre-established defensive positions on the north bank of the river Seine dozens of miles to the east. It was that fatal failure to retreat that led to the Allies launching Operation Cobra – and to the Germans being routed in Normandy.

German armour destroyed in the Normandy village of Roncy during Operation Cobra (US Signal Corp/Washington National Archives)

However, the crucial development that really ensured that the Germans were routed actually took place at a Nazi HQ a thousand miles to the east – namely the failure of a German military plan to kill Hitler, install a new government and try to negotiate a ceasefire (with the Western allies) and an orderly withdrawal from France.

Instead, the failure of that German anti-Nazi military coup (which had been scheduled for 20 July 1944) made it virtually impossible for the top German commander in France (who had been cognisant of and sympathetic to the coup plan) to disobey Hitler’s order not to even stage a tactical retreat.

Through detailed fieldwork, the archaeologists, investigating the German collapse in Normandy, are discovering evidence of previously unknown allied ambushes and other key military engagements – and, by mapping individual finds, the investigators hope to reconstruct how this crucial battle unfolded.

Top Operation Cobra commander, Major General J Lawton Collins (right) pictured speaking to Lieutenant General Omar Bradley (left) in Normandy in 1944 (Army Signal Corps/Naval Historical Center)

So far they’ve located two previously unknown German mass graves and have unearthed thousands of German and allied machine gun bullets, as well, as pistol and rifle bullets, rifles, hand grenades, armour-piercing shells and bazooka rockets. They have also found parts of British air-to-ground missiles – and graphic evidence of the havoc wrought by them on German positions.

“These new excavations will for the very first time allow historians to more fully understand the details of how the German collapse in Normandy unfolded,” said a leading expert on Cobra, James Holland, author of the most recent study on the subject, Normandy ’44: D-Day and the Battle for France.

In July 1944, the anti-Hitler commander of German forces in western France (including Normandy) – a field marshal called Gunther von Kluge – knew that an assassination attempt on Hitler was about to take place and was no doubt hoping that a non-Nazi government would therefore come to power and potentially negotiate a ceasefire with the Western allies.

An American 75mm tank shell, found by the archaeologists during their excavations (Battlefield Archaeology Group)

An unexploded American hand grenade found immediately adjacent to a German dugout (Battlefield Archaeology Group)

Once the field marshal knew that the assassination attempt had failed, any tactical retreat at that late stage would have been regarded by Hitler as particularly disloyal and might have led the German dictator to suspect that Von Kluge had been involved in, or was aware of, the plot. Von Kluge’s vulnerable state of mind was highlighted shortly after Operation Cobra when Hitler summoned him to Berlin. So fearful was he of Hitler’s post-assassination-attempt wrath that he committed suicide en route to the German capital.

The archaeologists investigating Cobra have also discovered parts of German armoured cars, tanks, motorcycles and other vehicles (and evidence of horse-drawn carts and probable artillery pieces) – as well as a number of landmine detonators and lots of flares used by the Germans to desperately try to call in support.

In terms of personal effects and equipment, the excavations have unearthed German boots and ammunition pouches as well as buttons, buckles, money, back-pack clips, water bottles, gas masks, machine-gun tool kits and spare machine gun barrels and ammunition belts.

As well as probable mass grave sites, they have also discovered German human remains in incinerated vehicles.

German soldiers from a Panzer division which was totally destroyed during Operation Cobra (Deutsches Bundesarchiv)

American armoured and infantry forces pass through the Normandy town of Coutances during Operation Cobra (US National Archives)

“It’s the first time that a large-scale archaeological investigation into Operation Cobra or any other Second World War military activities in Normandy has been carried out,” said the project’s lead archaeologist, Cameron Ross, director of the UK-based Battlefield Archaeology Group.

It was the success of Operation Cobra that allowed the D-Day landings to be translated into the liberation of northern France and ultimately the defeat of Nazi Germany.

And yet, compared with D-Day and other famous events of the Second World War, it’s comparatively little known.

As well as German military failings and the impact of the assassination plot failure, there were a number of other factors which led to the German defeat in Normandy.

Destroyed German armour at one of the Operation Cobra sites which archaeologists have been excavating (US Signal Corp/Washington National Archives)

Cobra featured some extraordinary military innovations that were developed and deployed in (and in the build-up to) that campaign (things like direct tank-unit to aircrew VHF communications; more effective infantry and tank co-operation; large-scale use of air-to-ground armour-busting rockets; new obstacle clearance technology; intense cluster bombing; and new more sophisticated ambush tactics).

Cobra’s outstanding success was also down to the exceptional skills of the people in charge of running the operation – especially a US colonel called Richard G McKee (and, crucially, the personal “chemistry” between those senior people). McKee had an almost unparalleled eye for detail, while his colleague Major General Joe Collins was decisive and innovative.

In contrast to many other campaigns, there was also an absence of serious rivalry and discord between the people in charge. That absence helped create an increased degree of efficiency and clarity.

German ammunition canister – with 250 live machine gun rounds – unearthed by the archaeologists (Battlefield Archaeology Group)

Two German gas masks, discovered by the archaeologists in a German dugout (Battlefield Archaeology Group)

What’s more, because Cobra was, in effect, at the very beginning of the Western allies’ main land campaign against Hitler, there was a lack of complacency and arrogance (the so-called “victory diseases” that contributed to several specific military failures in subsequent months).

Looking at it from the Allied point of view, the operation was an unparalleled triumph. But looked at from a German perspective, it was an utter disaster in which entire German units, totalling thousands of men, simply disappeared.

Operation Cobra is one of the least famous and, until now, under-researched key episodes of the Second World War.

And yet it was also the pivotal campaign that helped deliver victory for Britain and the US in western Europe.

Arguably, it marked the beginning of the end for the Nazis in the western half of our continent.

Cobra was a joint ground/air operation with the ground aspect mainly American and the crucial air aspect partly British. But the entire operation was only made possible by the damage already done to German forces by British, Canadian and US forces in the weeks before Cobra.

The newly emerging narrative as to what actually happened in the killing fields of Operation Cobra is largely being shaped by the new archaeological detective work.

In many cases, the key finds will shed new light on the various cutting-edge military innovations – which helped make victory in western Europe possible, but are largely unknown to the general public and indeed to many historians.

Landing on the Normandy beaches was a huge achievement – but breaking out of that bridgehead, punching precision holes in the German lines, with new and innovative military technology, and putting the Germans to flight was an equally remarkable accomplishment.