The invasion of Normandy was the invasion and establishment of Allied forces in Normandy, France, during Operation Overlord in World War II.
The invasion was the largest amphibious operation in history. This article covers from the initial landings on 6 June 1944, until the time of the Allied breakout in late July.
Allied land forces that saw combat in Normandy on 6 June came from Canada, the Free French Forces, the United Kingdom, and the United States. In the weeks following the invasion, Polish forces also participated, as well as contingents from Belgium, Czechoslovakia, Greece, and the Netherlands. Most of the above countries also provided air and naval support, as did the Royal Australian Air Force, the Royal New Zealand Air Force, and the Royal Norwegian Navy.
The Normandy invasion began with overnight parachute and glider landings, massive air attacks, naval bombardments, early morning amphibious landings on five beaches codenamed Juno, Gold, Omaha, Utah, and Sword and during the evening the remaining elements of the parachute divisions landed. The "D-Day" forces deployed from bases along the south coast of England, the most important of these being Portsmouth.
The objective of the operation was to make a lodgement that was anchored in the city of Caen (and later Cherbourg when its deep-water port was captured). As soon as Normandy could be secured, the Western European campaign and the downfall of Nazi Germany could begin. About 6,900 vessels were to be involved in the invasion, under the command of Admiral Sir Bertram Ramsay (who had been directly involved in the North African and Italian landings), including 4,100 landing craft. A total of 12,000 aircraft under Air Marshal Sir Trafford Leigh-Mallory were to support the landings, including 1,000 transports to fly in the parachute troops; 10,000 tons of bombs would be dropped against the German defences, and 14,000 attack sorties would be flown.
Some of the more unusual Allied preparations included armoured vehicles specially adapted for the assault. Developed under the leadership of Maj. Gen. Percy Hobart (Montgomery’s brother-in-law, and an armoured warfare specialist), these vehicles (nicknamed Hobart's Funnies) included "swimming" Duplex Drive Sherman tanks, the Churchill Crocodile flame throwing tank, mine-clearing tanks, bridge-laying tanks and road-laying tanks and the Armoured Vehicle, Royal Engineers (AVRE)–equipped with a large-caliber mortar for destroying concrete emplacements. Some prior testing of these vehicles had been undertaken at Kirkham Priory in Yorkshire, England. The majority were to be operated by small teams from the British 79th Armoured Division attached to the various formations.
Planning of the invasion
Allied forces rehearsed their roles for D-Day months before the invasion. On 28 April 1944, in south Devon on the English coast, 638 U.S. soldiers and sailors were killed when German torpedo boats surprised one of these landing exercises, Exercise Tiger.
In the months leading up to the invasion, the allied forces conducted a deception operation, Operation Fortitude aimed at misleading the Germans regarding the date and place of the invasion.
There were several leaks prior to or on D-Day. One such leak was the crossword that came out in The Herald and Review six days before the beach landings were to take place. Some of the answers consisted of Overlord, Neptune, Gold and other key terms to the invasions; the US government later declared that this was just a coincidence. Through the Cicero affair, the Germans obtained documents containing references to Overlord, but these documents lacked all detail. Double Cross agents, such as Juan Pujol (code named Garbo), played an important role in convincing the German High Command that Normandy was at best a diversionary attack. U.S. Major General Henry Miller, chief supply officer of the US 9th Air Force, during a party at Claridge's Hotel in London complained to guests of the supply problems he was having but that after the invasion, which he told them would be before 15 June supply would be easier. After being told, Eisenhower reduced Miller to Colonel and sent him back to the U.S. where he subsequently retired. Another such leak was Gen. Charles de Gaulle's radio message after D-Day. He, unlike all the other leaders, stated that this invasion was the real invasion. This had the potential to ruin the Allied deceptions Fortitude North and Fortitude South. For example, Gen. Eisenhower referred to the landings as the initial invasion.
Codenames
The Allies assigned codenames to the various operations involved in the invasion. Overlord was the name assigned to the establishment of a large-scale lodgement on the northern portion of the Continent. The first phase, the establishment of a secure foothold, was codenamed Neptune. According to the D-day museum:
- "The armed forces use codenames to refer to the planning and execution of specific military operations. Operation Overlord was the codename for the Allied invasion of northwest Europe. The assault phase of Operation Overlord was known as Operation Neptune. (...) Operation Neptune began on D-Day (6 June 1944) and ended on 30 June 1944. By this time, the Allies had established a firm foothold in Normandy. Operation Overlord also began on D-Day, and continued until Allied forces crossed the River Seine on 19 August 1944."
Officers with knowledge of D-Day were not to be sent where there was the slightest danger of being captured. These officers were given the codename of "Bigot", derived from the words "To Gib" (To Gibraltar) that was stamped on the papers of officers who took part in the North African invasion in 1942. On the night of April 27, during Exercise Tiger, a pre-invasion exercise off the coast of Slapton Sands beach, several American LSTs were attacked by German E boats and among the 638 Americans killed in the attack and a further 308 killed by friendly fire, ten "Bigots" were listed as missing. As the invasion would be cancelled if any were captured or unaccounted for their fate was given the highest priority and eventually all ten bodies were recovered.
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