I just recently found that Polish partisan’s unit AK "Kampinos" which fought in Kampinos Forest west from Warsaw as a cover for Warsaw Uprising has a car some sort of truck with exactly the same gun as germans in North Africa on first photo. How they obtain this gun before uprising is unknown but were very proud because this AA weapon as I read in Borkiewicz book and installation was build by them based on civilian truck.
So there is original article from uprising page about two downed german aircrafts in 1944 by polish (google translator to english)
https://translate.google.com/transla...-text=&act=url
look on the left side in -> Rise -> Downed aircraft
