Czechoslovakia had been set up under the Treaty of Versailles, which Hitler promised to overturn. He saw invading the Sudetenland as the first step in destroying Czechoslovakia and 'righting' another 'wrong' of the Treaty. Czechoslovakia had a big army and strong fortifications. The Sudetenland was home to forts, railways and industries, which could all be used as part of Hitler's war effort in years to come: the area had many factories producing glass and lignite, as well as the Skoda factory, which could be used to build tanks and other weapons