Key Facts
- Start date
- 25 July 1944
- Opening strike
- Concentrated aerial bombardment by thousands of Allied aircraft
- Notable friendly fire casualty
- Lt. Gen. Lesley J. McNair killed by own bombardment
- Key city liberated
- Avranches, freed by 31 July 1944
- German counterattack
- Unternehmen Lüttich launched 7 August near Mortain
- Strategic result
- Creation of the Falaise pocket; German position in NW France lost
Strategic Narrative Overview
The offensive opened on 25 July 1944 with a massive aerial bombardment that caused some friendly fire casualties. Progress on the first day was slow, but by 27 July organized German resistance had largely crumbled. VII and VIII Corps advanced rapidly, isolating the Cotentin Peninsula. A German counterattack at Mortain on 7 August—Unternehmen Lüttich—failed costly, and on 8 August the newly activated Third U.S. Army captured Le Mans, the former German 7th Army headquarters.
01 / The Origins
Seven weeks after the D-Day landings, Allied forces remained hemmed in by determined German resistance and difficult bocage terrain in Normandy. Lieutenant General Omar Bradley planned Operation Cobra to exploit British and Canadian pressure around Caen, which had drawn the bulk of German armored reserves away from the American sector, creating an opportunity to punch through weakened German lines and break out into open country.
03 / The Outcome
German forces were unable to reconstitute coherent defensive lines as Allied units swept around their flanks. The collapse of resistance led directly to the Falaise pocket, encircling large German formations and destroying the German strategic position in northwestern France. Operation Cobra, combined with simultaneous British and Canadian offensives, secured Allied victory in the Normandy campaign and transformed attritional bocage fighting into rapid maneuver warfare.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Omar Bradley, Lesley J. McNair.
Side B
1 belligerent
Günther von Kluge.
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.