The major part of Silesia remaining in Germany, was reorganised into the two provinces of Upper Silesia and Lower Silesia. After the Nazi's rise to power, the synagogues in modern-day Wrocław () and in many other cities were destroyed during Kristallnacht of 1938. In October 1938, Zaolzie (part of Cieszyn Silesia, the disputed area west of the Olza River: with 258,000 inhabitants), was taken by Poland from Czechoslovakia following the Munich Agreement that surrendered border areas of Czechoslovakia to Nazi Germany. Czech Silesia with Slezská Ostrava was incorporated into the Sudetenland Gau, while Hultschin was incorporated into Upper Silesia province.