It was one of the strangest operations carried out during the Second World War.
In 1943, Allied forces had begun amassing along the coast of North Africa in preparation to make a push on the strategically important target of Sicily.
For the invasion to succeed, British Intelligence needed to convince the Germans they were aiming for somewhere else, so that they would divert resources.
Operation Mincemeat was born.
It was the brainchild of Ian Fleming, the creator of James Bond, who at the time worked as an assistant to the head of British Naval Intelligence.
The unusual tale was later popularised in a book by Ben Macintyre in 2010.
The idea was to plant a dead body dressed as a British officer off the coast of Spain, carrying 'secret' documents revealing Greece and Sardinia as the targets for the upcoming invasion.
Spain was chosen as the location for the deception because although officially neutral, it had many Nazi spies who could pass the fake intelligence up the chain of command.
For the plan to work, the false identity of the body needed to meticulous.
Glyndwr Michael had been a homeless Welsh labourer who died after eating rat poison.
His corpse was selected to become the fictitious Captain (Acting Major) William 'Bill' Martin, an officer in the Royal Marines, and was subsequently kept in cold storage until the plans were in place.
It took three months for intelligence officers Charles Cholmondeley and Ewen Montagu to painstakingly create the appropriate identification and other papers for Maj Martin.
He was given an identity card, No148228 and also personal documents to give him a credible backstory.
These included a photograph of his fiancée, a receipt for an engagement ring, a theatre ticket stub and even two love letters.
A newspaper even ran a line mentioning the death of "A/Major W. Martin".
A suitcase containing the fake documents was handcuffed to his wrist and he was dressed in a lifejacket to look like he had been in a plane crash.
In April 1943, the body was dropped into the sea from a Royal Navy submarine and then floated towards the coast of Spain.
Maj Martin was found by a Spanish fisherman and passed over to German intelligence.
They were fooled by the plot, transferring 90,000 German soldiers to Greece, the dummy target.
When the Allies invaded Sicily on 9 July, the island fell but with a fraction of the casualties initially feared.
It is estimated that Operation Mincemeat saved the lives of thousands of British, Canadian and American troops.
Maj Martin was eventually buried with full military honours in Nuestra Señora cemetery in Spain.
In 1998, after the British Government identified the body as Glyndwr Michael, the inscription 'Glyndwr Michael Served as Major William Martin, RM' was added to the headstone.
Cover image: Identity card of Major William Martin (Picture: The National Archives).