An impression by "J.P." of the R.A.F. attack by Whitleys on the snow-covered Skoda armament works at Plzen in Czechoslovakia on the night of October 27 [1940].
Source: Flight, 29 December 1940, 536 (link).
Perhaps I'm just cynical, but I'm guessing that this night raid on the Skoda works was not nearly as accurate as shown here, even if it was carried out at such a low level -- though I don't have access to the Bomber Command war diaries to verify my suspicion.
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