After the Treaty of Versailles, French Marshal Ferdinand Foch said "This is not a peace. It is an armistice for twenty years." Exactly 20 years and 65 days later, WW2 broke out.
On 11 November 1918, Foch accepted the German request for an armistice. Foch advocated peace terms that would make Germany unable to pose a threat to France ever again. He considered the Treaty of Versailles too lenient on Germany and as the Treaty was being signed on 28 June 1919, he declared: "This is not a peace. It is an armistice for twenty years. His words proved prophetic: the Second World War started twenty years and 65 days later.