https://en.wikipedia.org/wiki/German_oc ... hoslovakiaThe German occupation of Czechoslovakia (1938–1945) began with the German annexation of Czechoslovakia's border regions known collectively as the Sudetenland, under terms outlined by the Munich Agreement. German leader Adolf Hitler's pretext for this action was the alleged privations suffered by the ethnic German population living in those regions. New and extensive Czechoslovak border fortifications were also located in the same area.
Following the Anschluss of Austria to Nazi Germany, in March 1938, the conquest of Czechoslovakia became Hitler's next ambition. The incorporation of the Sudetenland into Germany that began on 1 October 1938 left the rest of Czechoslovakia weak, and it became powerless to resist subsequent occupation. Part of the borderland region known as Zaolzie was occupied and subsequently returned to Poland after Czechoslovakia previously annexed it from Poland prior during the Polish-Soviet War. On 15 March 1939, the German Wehrmacht moved into the remainder of Czechoslovakia and, from Prague Castle, Hitler proclaimed Bohemia and Moravia the Protectorate of Bohemia and Moravia. The occupation ended with the surrender of Germany following World War II.