'Viola' was an Allied trio of deceptions to supplement 'Rosebud' and thus part of the effort to persuade the Germans of the reality of Lieutenant General George S. Patton’s US 1^st Army Group in the south-eastern part of England as the formation which was yet to deliver the primary assault on France after the 'diversion' of the 'Overlord' landing (July 1944).

'Viola I' simulated the fictitious British 55^th Division making an amphibious assault with the fictitious British naval Force 'M' followed by a ground exercise in Hayling Island area, showing lateral links between the force and the task force commander. 'Viola I' was preceded by 'Vanity I', 'Vanity II' and 'Honeysuckle'.

'Viola II' simulated the fictitious US 17^th Division making an amphibious assault with the fictitious British naval Force 'N' followed by a ground ex­ercise in Studland Bay area, showing lateral links between the force to the task force commander. 'Viola II' was preceded by 'Haircut' and 'Jitterbug'.

'Viola III' simulated fictitious US 59^th Division making an amphibious assault followed by ground exercise in Felix­stowe area, showing lateral links to establish the position of the fictitious British naval Force 'F' in the supposed task force for the 'Fortitude South II' landing. 'Viola III' was preceded by 'Mustache' and 'Film Star'.