World War Two really started shortly after the end of the First World War, when Polish militias attacked German units in East Germany in an attempt to create facts of Polish territorial gains before the imminent referendums. The battles between Polish and German militias over these territories continued into 1921, when Germany, under the pressure of the Allied victors, finally gave up and let Poland have its spoils. But the territories conquered and at the end seceded to Poland were inhabited to no small degree by Germans, in some areas by a vast majority of them, as numerous ignored referendum results have proved. Hence, this ethnic conflict kept on festering, until it finally resurged in the late 1930s, when Poland implemented a policy of “ethnic pressure” to drive all ethnic Germans out of its conquered western territories. This policy escalated at the dawn of WWII into a violent ethnic cleansing.