نيران صديقة
Nearly 5,000 RAF airmen prepared to take part in 817 heavy bombers which were fuelled and armed in the evening. A trigger plan was prepared, which would act as a feint but, this night, Bomber Command amended the feint which was partially compromised by weather conditions. Restrictions on the flight path of the bombers was also changed. Bomber streams were permitted to fly over Ingoldmells Point to Filey; but not over coastal areas where no ground defences were stationed. The route took them downstream to southern England by Reading, and across the English Channel, as the trigger plan required. However, they were then ordered to turn back toward the North Sea. The reason behind this was the low-lying cloud which was ever-present over the continent that night. The clouds made it difficult for pilots to see and steer clear of zones heavily guarded by Allied ground defences near to the frontline. The possibility of losing aircraft to Friendly fire was too great.