 Because of that, in April 1939 the General Inspectorate of the Armed Forces dispatched Col. Tadeusz Zieleniewski to prepare plans of fortifications along the border to cover the southern flank of the Kraków Army in case of an armed conflict with Nazi Germany.The plan assumed creation of four major fortified areas sealing all four river valleys in the area.The Soła valley was to be blocked by 20 large bunkers located around the village of Węgierska Górka, the Koszarawa was to be sealed in Korbielów, Krzyżowa and Przyborów, the Skawa shielded in Bystra and Jordanów, while the Raba River valley was to be defended by bunkers built in Raba Niżna.