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    Operational scopeNormandy, the Belgian coastline, the English Channel and the English coastline; initial Army proposals of 25 July 1940 envisaging landings from Kent to Dorset, Isle of Wight and parts of Devon; subsequently refined to a confined group of four landing sites in East Sussex and western Kent
    PlannedSeptember 1940
    Planned byOKW
    ObjectiveElimination of the United Kingdom as a base of military operations against the Axis powers
    Air power

    The success of the German invasion of Denmark and Norway, on 9 April 1940, had relied extensively on the use of paratroop and glider-borne formations (Fallschirmjäger) to capture key defensive points in ad… See more

    Navy

    The most daunting problem for Germany in protecting an invasion fleet was the small size of its navy. The Kriegsmarine, already numerically far inferior to Britain's Royal Navy, had lost a sizeable portion of its large modern sur… See more

    Army

    Providing armour support for the initial wave of assault troops was a critical concern for Sea Lion planners, and much effort was devoted to finding practical ways of rapidly getting tanks onto the invasion beaches in … See more

    Broad versus narrow front

    The German Army High Command (Oberkommando des Heeres, OKH) originally planned an invasion on a vast scale, envisioning landing over forty divisions from Dorset to Kent. This was far in excess of w… See more

    German coastal guns

    With Germany's occupation of the Pas-de-Calais region in northern France, the possibility of closing the Strait of Dover to Royal Navy warships and merchant convoys by the use of land-based heavy artillery bec… See more

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