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D-Day produced thousands of code names, acronyms, abbreviations and many other strange and unusual terms and names!

We have compiled a list of some of the most common terms related to D-Day. If you think something is missing, please let us know.

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Supreme Headquarters Allied Expeditionary Force

The headquarters that was in overall command of the Allied forces on D-Day and during the Battle of Normandy. It was commanded by General Dwight D Eisenhower.

Sword Beach

The codename for the British landing beach close to Ouistreham. On D-Day the landings on Sword Beach were led by the British 3rd Division.

Taxable, Operation

The codename for a deception operation that took place on the night before D-Dat. Taxable simulated an invasion force sailing towards the Normandy coast further north from where the actual landings would take place.

Thunderclap, Exercise

The codename for General Sir Bernard Montgomery’s final presentations of his plans for D-Day and Operational Overlord at St Paul’s School in London on 7 April and 15 May 1944.

Tiger, Exercise

The codename for a large exercise held by US forces at Slapton Sands in Devon in April 1944. The exercise was attacked by German E-Boats, causing the death of 749 US servicemen.

Titanic, Operation

The codename for a group of deception operations that took place on the night before D-Day. Titanic consisted of the dropping of dummy paratroopers, metal foil known as ‘chaff’, which confused German radars and dropping special forces. The aim was to confuse the Germans and draw their attention away from the real landing beaches.

Todt Organisation

A civil and military engineering group from 1933 to 1945, named after its founder Fritz Todt. The Todt Organisation built many of the German defences on the Atlantic Wall.

Tonga, Operation

The codename for the British 6th Airborne Division’s landing on the eastern flank of the landing beaches in Normandy.

Torch, Operation

The Allied landings in French North Africa in 1942.

Totalize, Operation

The codename for a British and Canadian offensive on 8 and 9 August 1944. The objective was to break through the German defences south of Caen and advance towards Falaise.

Tractable, Operation

The codename for an offensive carried out by Canadian and Polish troops between 14 and 21 August 1944. The objective was to capture the towns of Falaise, Trun and Chambois and close the Falaise gap.

Transportation Plan

The plan developed by the Allies before D-Day to bomb railway yards in France in order to prevent the Germans from being able to send reinforcements to Normandy.


U-boat is English translation of the German word U-Boot, a shortening of Unterseeboot, literally ‘undersea boat’. On D-Day Allied naval and air forces patrolled the English Channel to prevent German U-boats from attacking the landing forces.


The Allied codename for the intelligence taken from intercepts of the German Enigma signals. Ultra intelligence was given to senior commanders during the Battle of Normandy to help them to base their plans on what the Germans were doing.

Utah Beach

The codename for the western-most US landing beach on the east coast of the Cotentin Peninsula. On D-Day the landings were led by the US 4th Infantry Division.


A variety of German unmanned ‘vengeance weapon’ that was targeted at Britain from 13 June 1944 onwards.


A variety of German unmanned ‘vengeance weapon’ that was targeted at Britain from September 1944 onwards.

Vichy France

After the fall of France in 1940 the German armed forces occupied the north-west of France. Vichy France is the common name of the French government, headed by Marshal Philippe Pétain, in the unoccupied “Free Zone” in the southern part of metropolitan France and theoretically, the French colonial empire


A type of glider designed by the Waco Aircraft Company. The Waco was mainly used by US airborne forces.


The German Armed Forces during the Second World War.

Western Task Force

A group of naval vessels that supported the US landings on D-Day. It included bombarding warships, minesweepers escorts, assault ships and landing craft.


The codename for the floating roadways that ran from the Mulberry harbours onto shore. These allowed ships to unload vehicles.


British midget submarines. X-craft were used to carry out missions along the Normandy coast before D-Day and to mark the routes to the landing beaches.