 The Prussian Province of Silesia within Germany was then divided into the provinces of Lower Silesia and Upper Silesia.Meanwhile, Austrian Silesia, the small portion of Silesia retained by Austria after the Silesian Wars, was mostly awarded to the new Czechoslovakia (becoming known as Czech Silesia and Zaolzie), although most of Cieszyn and territory to the east of it went to Poland.Polish Silesia was among the first regions invaded during Germany's 1939 attack on Poland.