Preventive war – policy of the First Marshal Józef Piłsudski in the face Germany in the first half of the 30s of the XXth century

Political and military issues which were connected with the problem of so called preventive war – the conception of the First Marshal Józef Piłsudski in the face of reconstruction of the military (reduced  after the end of the First World War) by the Weimar Republic and then the Third Reich are presented. Actions undertaken by Piłsudski were supposed to bring normalization of political relations between Poland and Germany and protection of western borders of the Second Polish Republic. In the article, in the chronological order the political line of the Polish side in the face of political transformations taking place in Germany, the rising of Adolph Hitler, is presented. Piłsudski’s military plans in the face Germany has been characterized; that is the conception of being at preventive war. Contemporary  military potential of both countries has also been compared.