20 Lancasters from 408 and 419 Squadrons were joined by 88 Halifaxes from 420, 424, 425, 426, 427, 429, 433, and 434 Squadrons on an attack of 2 coastal gun batteries at Calais and St. Valery en Caux. The crews were over the targets at between 5,000 and 11,000 feet, releasing 928,000 lbs of high explosives. According to reports, they were accurately bombed.
F/Sgt H. Speight from 419 squadron was followed 3 times by an enemy
aircraft, it never fired due to evasive action.
F/Sgt R. Burton from 424 Squadron returned early as the port inner was
u/s. They landed safely at base on 3 engines.
While some crews went to the coastal guns, 16 Halifaxes from 428 squadron were sent on a mining operation to Morlaix, St. Malo, Brest, Lorient and St. Nazaire. The crews were over the gardens at between 8,000 and 15,000 feet, sowing 32@1500 lb mines.
All crews returned safely to base.