High Quality Content by WIKIPEDIA articles! The Battle of Sedan or Second Battle of Sedan (12–15 May 1940) was a Second World War battle fought during the French Campaign. The battle was part of the German Wehrmacht`s operational plan codenamed Fall Gelb (Case Yellow), to encircle the Allied armies in Belgium and north-eastern France. German Army Group A crossed the Meuse river with the intention of capturing Sedan and pushing northwards towards the Channel coast, in order to entrap the Allied forces that were advancing east into Belgium, as part of the Allied Dyle Plan strategy.