Hello Bill,
I was born In Bergstadt, my aunt Margarete was married to a Thoendel.My cousins Franz,Traudl,Iris and Peter lived in Diedorf kreis Augsburg Germany, last known address Maisenweg 4. Trying to make contact via the Kirchlicher Suchdienst. We last visited them in 1956. can not remember their father's name but they were definitely from the Bergstadt/ Romerstadt area.
You can currently use Google maps which will allow you to "walk" through Bergstadt and view the place.
Regards
Gustav