Hiya
Just thought I would share with you all some info I have received from the ministry for my Grandfather who was a POW in WW1, he was serving in the 6th Battalion of the Black Watch and was captured on 21st March 1918 in "Beugany" and held in Frankfurt until the end of the war. We all wonder where about the POWs where so hope this helps you. Am not sure of the Beugany spelling or where about in Frankfurt, but at least its a starting point.
Carolyn x