Hello
The reference is to a German Assault Gun unit (Sturmgeschutz = Assault Gun), Battalion 115 (Abt = Abteilung or Battalion or Detachment depending on the context). Often abbreviated to Stug III (or Stug IV) when referring to the vehicles themselves.
Abt 115 were in Italy at some point during World War Two but I don't know the exact details.
Roger
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