The treaty of Versailles which was agreed after world war 1, to avert such war in the future, part of the treaty was the limitation of Germany in having an army of not more than 100,000 men.
However, Hitler broke the treaty of Versailles, by building up the military army not just for war, but also to salvage economic situation of Germany.
Hitler further broke the treaty of Versailles in many ways by invading Austria in 1936, and also Czechoslovakia in 1938.
