@article{Łach_2020, title={Plany rozbudowy fortyfikacyjnej w ramach Frontu Mazowieckiego wobec zagrożenia niemieckiego z Prus Wschodnich w 1919 r.}, volume={56}, url={https://apcz.umk.pl/KLIO/article/view/KLIO.2020.062}, DOI={10.12775/KLIO.2020.062}, abstractNote={<p align="center"><strong>ABSTRACT</strong></p><p>In the military nomenclature, the area of northern Mazovia was referred to as "Mazovian theater". This concept was introduced after the First World War by the Supreme Command of the Polish Army. After the end of the First World War in 1919, there were fears related to the plans of the German attack on Poland. In this situation, the Polish command decided to create an anti-German front turned to the north and west, which was the Masovian Front. The task of this front was the extension of field fortifications. As a result of these actions, German and Russian fortifications located on the Narew were adapted to the new situation. Their task was to defend the main transport routes, especially the bridges on the Narew River in Wizna, Łomża, Ostrołęka and Różanie. Using the method of source text analysis, it was pointed out that the German attack did not finally take place, and the pre-prepared fortifications in northern Mazovia were used in the Polish-Bolshevik war in 1920. They have contributed to effective suppression of the Red Army and better preparation of the area to be defended. The aim of the article is to present plans for the expansion of the Masovian Front against the German threat from East Prussia in 1919. The basis for writing the article were source materials that are in the Central Military Archive in Warsaw.</p>}, number={4}, journal={Klio - Czasopismo Poświęcone Dziejom Polski i Powszechnym}, author={Łach, Wiesław Bolesław}, year={2020}, month={lis.}, pages={89–110} }