"The Germans pushed east."

This refers to the German advance towards Slonim during World War II, after Germany broke the Treaty of Non-Aggression between Germany and the Soviet Union (or Molotov-Ribbentrop Pact) by invading the Soviet Union in 1941. Germany captured Slonim and unspeakable atrocities followed. The worst occurred on 14 November, 1941, when 9,000 Jews (70% of Slonim’s Jewish population) were massacred in a single Nazi operation.