Foch's pre-war contributions as a military theorist and lecturer have also been recognised, and he has been credited as "the most original and subtle mind in the French Army" of the early 20th century. Paris Peace Conference In January 1919, at the Paris Peace Conference Foch presented a memorandum to the Allied plenipotentiaries in which he stated: In a subsequent memorandum, Foch argued that the Allies should take full advantage of their victory by permanently weakening German power in order to prevent her from threatening France again: However, the British Prime Minister David Lloyd George and the American President Woodrow Wilson objected to the detachment of the Rhineland from Germany so that the balance of power would not be too much in favour of France, but agreed to Allied military occupation for fifteen years, which Foch thought insufficient to protect France. Foch considered the Treaty of Versailles to be "a capitulation, a treason" because he believed that only permanent occupation of the Rhineland would grant France sufficient security against a revival of German aggression. As the treaty was being signed Foch said: "This is not peace. It is an armistice for 20 years". Post-war career and legacy Foch was made a British field marshal in 1919, and, for his advice during the Polish–Soviet War of 1920, as well as his pressure on Germany during the Greater Poland Uprising, he was awarded the title of Marshal of Poland in 1923. On 1 November 1921 Foch was in Kansas City, Missouri, to take part in the groundbreaking ceremony for the Liberty Memorial that was being constructed there. Also present that day were Lieutenant General Baron Jacques of Belgium, Admiral David Beatty of Great Britain, General Armando Diaz of Italy and General John J. Pershing of the United States. One of the main speakers was Vice President Calvin Coolidge of the United States. The local veteran chosen to present flags to the commanders was a Kansas City haberdasher, Harry S. Truman, who would later serve as 33rd President of the United States from 1945 to 1953. In 1935 bas-reliefs of Foch, Jacques, Diaz and Pershing by sculptor Walker Hancock were added to the memorial. Foch made a 3000-mile circuit through the American Midwest and industrial cities such as Pittsburgh and then on to Washington, D.C., which included ceremonies at Arlington National Cemetery for what was then called Armistice Day. During the tour, he