Mild, dull, less wind. Warning from 11.40 a.m. till 12 noon. Went to see where the German plane crashed. The Scottish troops from the anti-aircraft station were removing the machine which was reduced to scrap. A boy gave me a piece of the self-sealing compound which the Germans use to make the petrol tank bullet proof. The night attack began at 7.53 p.m. but so well did our guns fire that no raiders got past the London area; they just turned tail and dwindled to silence in the darkness. Raid recommenced at 12.20 a.m. on the 21 Sat.
On this day: in fact over the period of 3 days, Atlantic convoy HX-72 is attacked by a group of German U-boats, which sunk 12 ships. Seven of these loses were overnight on 21-22 Sept., sunk by a single German U.00 which was not detected by the escorts.
- German army commanders are warned that troops will be sent to Rumania, to be stationed in case of war with the Soviet Union.