The Renault factory, in the town of Boulogne-Billancourt just west of the centre of Paris, was making an estimated 18,000 lorries a year for the German forces. 235 aircraft - 89 Wellingtons, 48 Hampdens, 29 Stirlings, 26 Manchesters, 23 Whitleys, 20 Halifaxes - were dispatched in 3 waves, the crews of the leading wave being selected for their experience. The plan called for the massed use of flares and a very low bombing level so that crews could hit the factory without too many bombs falling in the surrounding town. There were no Flak defences. 223 aircraft bombed the target, reporting excellent results. Only 1 Wellington was lost. The main raid lasted 1 hour and 50 minutes. Many records were broken that night. The number of aircraft sent to this one target - 235 - was the greatest by the R.A.F. to a single target so far in the war; the previous record was 229 to Kiel on 7/8 April 1941. . The raid was considered a great success and the destruction caused in the factory received much publicity. However French civilian casualties were heavy with at list 415 killed and 750 wounded