In 1943, during the height of the Second World War, the dead body of a man in his early thirties was released from HMS Seraph submarine off the southwest coast of Spain. This corpse carried fabricated letters outlining the Allies’ plan to attack Greece and Sardinia which convinced German forces to defend Greece and move away from the real target, Sicily. This successful, radical, and deceptive operation led by Ewen Montegue to disguise the Allied Invasion of Sicily using false-intelligence tactics forwarded the Allied victory and increased the prevalence of deception in war. This paper explores Operation Mincemeat’s revolutionary nature, the significance of its success, and its relevance today.