Uprising in Warsaw 1944.

Polish Army fighting against USSR aggressor.
History: 17 September 1939 USSR forces attacked Poland. USSR Red Army were murdering Polish POWS and quite small part of Polish civilians. USSR NKVD Stalin murdered 20000 Polish officers and generals POWS during Katyn Forest massacre 1940 (and not only in Katyn near Smolensk).

Polish Army against Red Army.

Polish half-track artillery tractor C4P with 105 mm cannon. In production from 1935. Engine was Polish Italian, FIAT-122B.  
Polish Army, Warsaw 1939.