On 14 May 1940, in a desperate attempt to stop German forces crossing the Meuse, the Advanced Air Striking Force launched an "all-out" attack by all available bombers against the German bridgehead and pontoon bridges at Sedan. The light bombers were attacked by swarms of opposing fighters and were devastated. Out of a strike force of 63 Battles and eight Bristol Blenheims, 40 (including 35 Battles) were lost. After these abortive raids, the Battle was switched to mainly night attacks, resulting in much lower losses.