The Germanisation of the Polish populous included limitedly planned and systemised elimination of the Poles. During the German invasion of Poland, divisions of the Einsatzgruppen were placed within the Wehrmacht, in accordance to the Special Prosecution Book for Poland composed via interviews with the German minority in the Second Polish Republic, carried out the elimination of the Polish intelligentsia, Intelligenzaktion. After the defeat of the Polish military, the extermination of the Polish intellectual elite was realised via operations like Operation Tannenberg, AB-Aktion, that would deprive Poland its political, scientific, social, cultural and militaristic elite.