Part V of the 1919 Treaty of Versailles had imposed severe restrictions on the size and capacities of Germany's armed forces. Germany was allowed no submarines, no naval aviation, and only six obsolete pre-dreadnought battleships; the total naval forces allowed to the Germans were six heavy cruisers of no more than 10,000 tons displacement, six light cruisers of no more than 6,000 tons displacement, twelve destroyers of no more than 800 tonnes displacement and twelve torpedo boats.[4]