As Element of the demilitarisation of the Rhineland, the city's fortifications had to be dismantled. This was a possibility to create two eco-friendly belts (Grüngürtel) across the metropolis by converting the fortifications and their fields of fire into big general public parks. This wasn't completed till 1933. In 1919 https://emilyf196wgm3.wikigiogio.com/user