At least for me... By means of Will McNally and his Will's Wargames Blog, I have found a new repository of old maps for my Leipzig Campaign: GeoGREIF from the University of Greifswald (Germany).
Because of my nonexistent German language skills, I can not profit from the full potential of the site, but I was able (by following the Will's instructions) to download old maps from the Saxony area at 1:25,000 scale and with all topographical features, including elevation lines.
The system is easy: enter in the 'Suchen' (Search) box MTBL NNEE where NN is the northing and EE the easting, and presto! For example, MTBL 4740 produces the following map for Lieberwolkwitz (see below).
For areas southwards, you must to increase the NN digits, and so. The maps are from ca. 1915 so you can ignore the railroad lines. I have not still explored all the possibilities, but I believe that with some research, you will find maps for all Saxony and maybe for other zones of Germany.
Many thanks to Will!