The Allies had already decided to mount an invasion of southern France (Dragoon), which occurred in August 1944. Vendetta's story was agreed in the first week of May and deception work started on 9 May. Its aim was to detain German forces in Southern France for up to twenty five days following the Normandy landings. The plan threatened a landing near Sete (chosen for its distance from the Dragoon landing site) by the US Seventh Army, consisting of fictional divisions, and some French units. Vendetta was supported by a diplomatic deception, Operation Royal Flush, which requested support from the Spanish government to allow injured soldiers to be evacuated following an invasion.