The RAF BC lost something like 600 bombers during the course of the Battle. They were quite active during the nights, and had some - though not decisive - direct effect on the course of the Battle; its enough to think of bombing of barges in French ports and the occasional - and less known - bombing by Blenheims of LW air bases in France. Indeed most historians tend to concentrate on the fighter vs fighter engagements, and neglect bomber operations too much.