On 24 January 1945 , Gliwice was occupied by the Red Army as part of their Allied Occupation Zone . Under borders changes dictated by the Soviet Union at the Potsdam Conference , Gliwice fell inside Poland 's new borders after Germany 's defeat in the war . It was incorporated into Poland 's Silesian Voivodeship on 18 March 1945 , after almost 600 years of being outside the Polish state
Potsdam Conference
Potsdam Conference
Gliwice