Operation Sphere
'Sphere' was the British overall designation of air patrols over the Strait of Dover (1941 onward).
Basic overview
Start date: 30 November 1939
End date: 30 November 1944
Scope: Minor
Nature: Air, Defence
Status: Implemented
End date: 30 November 1944
Scope: Minor
Nature: Air, Defence
Status: Implemented