A fairly matey report to the assembled public of the ramifications -- personal as well as official -- of ""Operation Overlord"" -- by the Chief of Staff to the Supreme Allied Commander (designate). In other words, all that went before the invasion of Nazi Europe from the northwest, -- the author's background and qualifications, the formal military circumstances, and hierarchy to be met, the integration and amalgamation of British, American, Canadian, South African and Australian parts of the organization, the problems presented by no precise precedent and the diagrams of operation -- proposed and actual. This is a story of time factors, of shipping, equipment, personnel, accommodations, techniques, expert application of long-sought know-how, of the development of staff, and the fate of each separate part of the overall plan. It is a picture of great activity -- before all the details of COSSAC went into effect -- of operations and exercises -- Husky, Mulberry, Rankin, Starkey, etc.;- of fabulous enterprise on such a scale that all working was conflict -- with Army, Navy and Air and the international factors presenting problems on all sides; of awkwardnesses that had to be surmounted for ultimate victory. A distinctly man-in-the-street accounting, from England, this should be sure fire in its human as well as military aspects.