 There was a general belief among the French High Command that the Polish armed forces had been incompetent, as well as a continuing belief in the impregnability of the Maginot Line.When General Maczek and his veterans tried to create a Polish mechanized division, they were not able to procure the equipment necessary for rapid training, so the new unit developed very slowly.This state of affairs changed when Germany invaded the Low Countries in 1940, out-flanking the French fortifications.