In December, 1949 Poland was invaded by the Chimera and was quickly overrun with severe casualties. For example, in the capital city of Warsaw, which boasted a pre-war population of two million, there were only one thousand survivors. By January, the Chimera had conquered the entire country, and were moving on toward Central Europe. It should also be noted that the Cloven followed in the Chimera's footsteps and began taking survivors and presumably began torturing, converting and/or eating them.
According to a Specter mission report, Poland was one of the major fronts in the war following the July 14th victory in London and Operation Overstrike, along with Northern France and Southern Spain. In 1953 European forces liberated Poland during the Battle of Warsaw by destroying the central hub tower in Warsaw.