Much of Poland's new industry and major population centers were located in the border area (particularly in Silesia); however, the lengthy border was very difficult to defend properly.
Banyak industri baru dan pusat-pusat populasi besar Polandia yang terletak di daerah perbatasan (terutama di Silesia); Namun, perbatasan yang panjang sangat sulit untuk dipertahankan dengan baik dan benar.