Answer:
He moved military forces into the Rhineland.
Step-by-step explanation:
After the end of World War I, Germany was forced to sign the treaty of Versailles, which was a peace treaty. This treaty meant that Rhineland has to be demilitarized. In 1936 the Nazies remilitarized Rhineland breaking the Versailles treaty. The invasion was part of the vengeance towards all the Allied nations that forced Germany to sign the Versailles treaty. Years later, the Nazies invaded other countries and territories.