Finally found that the answer to my original question might be not a film but a television series: Heimat #1, color and b&w, 924 minutes on nine VHS tapes, available from the German Language Video Center in Indianapolis, Indiana (1-317-547-1257).
This is the 16-hour story of a German family (the Simons) from the end of WWI to 1982. It was shown on PBS, sponsored by WGBH in Boston.
Apparently it was the ending of one of the shows that impressed me so much. Not so much, however, that I'm willing to shell out a buncha geld for all those VHS tapes (would consider less expensive DVDs if they ever become available).
This ring a bell with any of you? Ever recall seeing parts of it?
Other potentially interesting German WWII films are Mein Kreig, I Was 19, The Damned, and the three-part 08/15 (named for a gun that often malfunctioned). I haven't seen any of these but the descriptions sound interesting.