Years ago, I knew a man who had served in Breslau during the closing days of the war when the city had been surrounded by the Soviets. He later spent a number of years in a Russian POW camp and ended up in the US having immigrated as a DP sponsored by a Catholic charity.
Needless to say he had some hair-raising stories of his time in Breslau as a 17 yr old machine gunner. He mentioned being part of a "Feuerwehr" unit that rushed to plug holes in the line. Is there any way of finding out what unit he might have belonged to? (He has passed away) I know the Grossdeutschland used the "Feuerwehr" name but did other units use it as well? Perhaps SS?