The Boulton-Paul Defiant was the newest fighter in the RAF and was used in front-line day time duties in Fighter Command.On the 19th of July 141 Squadron of Defiants (nine aircraft) were sent up to intercept Bf110s that were reportedly dive bombing shipping off Dover. Whilst they were still climbing, a group of Bf109s were sweeping high above the English Channel with perfect visibility. Undetected by the climbing Defiants, the Bf109s were able to position themselves to attack from the sun. The brief but brutal combat resulted in the loss of six out of the nine Defiants and signalling the end of the RAF using them as daytime frontline fighters.19 July 1940Day: Dover raided. Defiant squadron largely destroyed.Night: Some activity between Isle of Wight and Plymouth, Thames Estuary and Harwich.Weather: Showery with bright intervals in most cases. Channel winds light - fair.This post details aircraft crashes, pilots, places, engagements, news and facts from the day's action.Follow us on Twitter @BofB1940 for real time tweets from the Battle of BritainAnd read our blog for more in depth analysis, revelations, descriptions and comment: http://bofb1940.blogspot.co.ukread by Kit Dunster