Henschel Hs 123
Pasted from Wikipedia:
The greatest tribute to the Hs 123 usefulness came in January 1943 when Generaloberst Wolfram von Richthofen, then commander-in-chief of Luftflotte 4, asked whether production of the Hs 123 could be restarted because the Hs 123 performed well in a theater where mud, snow, rain and ice took a heavy toll on the serviceability of more advanced aircraft.
Pasted from Wikipedia:
The greatest tribute to the Hs 123 usefulness came in January 1943 when Generaloberst Wolfram von Richthofen, then commander-in-chief of Luftflotte 4, asked whether production of the Hs 123 could be restarted because the Hs 123 performed well in a theater where mud, snow, rain and ice took a heavy toll on the serviceability of more advanced aircraft.