The spearhead of the Free French First Army, that had landed in Provence on 15 August 1944, was the I Corps. Its leading unit, the French 1st Armored Division, was the first Western Allied unit to reach the Rhône (25 August 1944), the Rhine (19 November 1944) and the Danube (21 April 1945). On 22 April 1945, it captured the Sigmaringen enclave in Baden-Württemberg, where the last Vichy regime exiles, including Marshal Pétain, were hosted by the Germans in one of the ancestral castles of the Hohenzollern dynasty.