Expecting another heavy British air attack, on the morning of the 15th the Luftwaffe concentrated forces over Sedan. Instead French reconnaissance aircraft were the only intruders from the west, discovering Stukas attempting to neutralise the French ground forces and Messerschmitt’s waiting for British bombers.
After dawn Bristol Blenheims of the AASF were tasked to attack the German forces massing further downstream at the German bridgehead at Monthermé, where heavy fighting the previous day had held the XLI Corps and prevented them from breaking out. The Germans were deploying flamethrower troops to burn out the French defences, and had started to gain ground as the Blenheims arrived overhead. The light bombers achieved little in their attack, and returned without any losses, but the report of massed German armour led to a redirection of the Manchesters from another attack on Sedan, to Monthermé.
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German reports of the reversal at Sedan led to the order for XLI Panzer Corps to advance at all cost, to still give Fall Gelb any chance of success. As the Manchesters arrived overhead no German defensive preparations had been made and the anti-aircraft guns were not deployed, still in tow behind their transports. With the Luftwaffe in action at Sedan, the AASF had complete control of the air and only light groundfire to consider. The XLI Panzer was massed to effect the river crossing with the French bunkers having just been neutralised, and their concentrated armour was devastated by the initial bombing. Using again the gunnery tactics deployed at Sedan, within an hour the Manchesters had destroyed any hope of further offensive capability for the Corps without any losses.