(Historical reasons for Second World War) The Remilitarization of the RhinelandThe Remilitarization of the Rhineland added spark to the cause of Second World War. Even Though having broken the Treaty of Versailles once, Adolf Hitler risked doing it a second time by marching 30,000 troops into Cologne on 7th March 1936. France, with 250,000 troops mobilized, remained passive because Britain would not support him. Britain took it on the lighter side with the view that Germany was ‘marching into his own back yard. To show that his remilitarization was popular, Hitler held a plebiscite, which showed that 98.8% were in favor. He went on to build his own defensive reinforcement, the Siegfried Line.