Of the 6 million Poles who died in WW2, 1/2 were Jews. About 1 in 5 Poles were killed during World War 2. A few hundred thousand civilians also died at the hands of the Soviets. Personally, I believe that WWII ended only when the last Soviet soldier left Poland.
Actually, I can make the case that that was when the Great War (WW1) finally ended.