Assume Western Allies, after the Anzio landings, despite their exploitation/effects decide upon a "hold and light pressure" campaign of the peninsula of Italy while forming up two plus corps of infantry and armor to assault France from the southern Med. in and about Marseille ...
COMBINED with ...
A similar 2+ corps landing effort a couple of days later on the Western-South-Western coast of France by the Allies (with troops/forces out of the UK) using their superior Naval assets to assist, after months long aviation offensive efforts in Bay of Biscay/West France by Strategic and Tactical Air Commands.
Places Germany on "Horns of Delima" to either moves forces in Northern France south (abandon some of "Atlantic Wall") to block Allied advance Northward, or let them do so while retaining Coastal Defenses of Northern France. ...
Meanwhile Allies have about 10-12+ Divisions in the south of France ready to move roughly Northward into France to offset German forces guarding northern beaches of France and/or Eastward into Northern Italy. Maybe both!
Come late July to early August the Allies have landings in Normandy focused upon four beaches, with air-landings of two+ divisions to the rear of them, yet Allied Forces advancing from southern France have already reduced and slightly distracted German/Axis forces on the Northern Beaches of France. The German forces, squeezed both to front and rear, have little option than to retreat Eastward to re-group and prep for next round of battles with the Western Allies!
Assorted landings are now lodgements that place the Allies in firm control of France within short order ...
COMBINED with ...
A similar 2+ corps landing effort a couple of days later on the Western-South-Western coast of France by the Allies (with troops/forces out of the UK) using their superior Naval assets to assist, after months long aviation offensive efforts in Bay of Biscay/West France by Strategic and Tactical Air Commands.
Places Germany on "Horns of Delima" to either moves forces in Northern France south (abandon some of "Atlantic Wall") to block Allied advance Northward, or let them do so while retaining Coastal Defenses of Northern France. ...

Meanwhile Allies have about 10-12+ Divisions in the south of France ready to move roughly Northward into France to offset German forces guarding northern beaches of France and/or Eastward into Northern Italy. Maybe both!
Come late July to early August the Allies have landings in Normandy focused upon four beaches, with air-landings of two+ divisions to the rear of them, yet Allied Forces advancing from southern France have already reduced and slightly distracted German/Axis forces on the Northern Beaches of France. The German forces, squeezed both to front and rear, have little option than to retreat Eastward to re-group and prep for next round of battles with the Western Allies!
Assorted landings are now lodgements that place the Allies in firm control of France within short order ...

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