[2] On 9 September a Wellington with serial number DV738 and code letters KX-C, flown by Plt Off František Bulis, had depth charged an unidentified U-boat, forcing it to dive.

Large patches of oil appeared on the sea surface after she dived, suggesting that the U-boat had at least been damaged.

On 27 September a Wellington with the serial number Z1147 and code letters KX-Q, flown by Flt Lt Václav Študent, depth charged U-165.

The U-boat returned fire with her 20 mm FlaK 30 machine guns, wounding four crew members including the co-pilot.

At 16:08 hrs, a wing-tip clipped a main road, flipping the plane over onto a piece of waste ground where dozens of children were playing.

[3] All the crew and passengers were killed, making the crash 311 Squadron's largest loss of life in a single incident.