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In page Sudetenland:

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The Sudetenland was assigned to Germany between 1 and 10 October 1938. The Czech part of Czechoslovakia was subsequently invaded by Germany in March 1939, with a portion being annexed and the remainder turned into the Protectorate of Bohemia and Moravia. The Slovak part declared its independence from Czechoslovakia and became the Slovak Republic (Slovak State), a satellite state allied to Germany. (The Ruthenian part, Subcarpathian Rus, made also an attempt to declare its sovereignty as Carpatho-Ukraine but only with ephemeral success since the area was soon annexed by Hungary.)[citation needed]