Okay, so there are not too many World War II-related series that I can find, and most of them are very short, at least in terms of number of episodes (they usually only have like three episodes each!). The only one of these I've managed to find in full with subtitles (in many languages, actually) is called Verstaubt sind die Gesichter
a.k.a. Dusty Faces
. It's five episodes ranging in length from 8 minutes and 16 seconds to 19 minutes and 40 seconds.
I found this series
from the Goethe Institut for people learning German, and there's also Extra auf Deutsch on YouTube (also for people learning German). Both have subtitles entirely in German (there are also equivalent Extra episodes available for people learning French, Spanish, or English, all with roughly the same plot, e.g. Episode 1 in English has pretty much the same plot as Episode 1 in German).
There are also a bunch of series without subtitles, like Berlin, Berlin
and Türkisch für Anfänger