Saturday the 31st of August 1940

Day: Conditions are ideal for the Luftwaffe to avoid interception over the Channel and attacks are launched in continuous waves, in differing group sizes, and at any altitude up to 25,000 ft or more. Main targets are again airfields in the South East, balloon defences, radar and other installations. All airfields attacked suffer some damage, including loss of fighters on ground or scrambling. Worst hit are Debden, Croydon, Biggin Hill, Hornchurch, North Weald and Duxford, Eastchurch.
No 141 Squadron and No 264 Squadron both flying Defiant's were re-allocated primarily to night fighting, henceforth operating with No's 13 and No 12 Group.

Fighter Command's heaviest losses on this day.

Night: All night activity over whole country, with Liverpool the main target.

Losses: Luftwaffe 41: Fighter Command 41 including losses on the ground.

Weather: Generally fair with much haze in the South and the Channel.