The first version predicted that Germans would attack from Pomerania towards Warsaw, with supporting thrusts from Silesia and Prussia, aiming at establishing an early link through the Polish Corridor between German Pomerania and Prussia. After German annexation of parts of Czechoslovakia and changes of borders, Polish planners revised the plan with the expectation that a main thrust would originate from Silesia through Piotrków and Łódź towards Warsaw and Kraków. The Polish planners correctly predicted the direction of most German thrusts, with one crucial exception: they assigned low priority to a possible deep, flanking, eastward push from Prussia and Slovakia, but that push was assigned high priority in the German plan ("Fall Weiss").