The outbreak of the War of the Sixth Coalition in 1813 signaled the approaching end of the French supremacy. The Battle of the Nations in mid-October removed France's grip on Germany, and the members of the Rhine Confederation either abandoned their French alliance or were overrun by the advancing Allies. On December 13, 1813, the Principality of Leyen was occupied by Austrian forces, declared "leaderless" because Prince Philip was residing in Paris at the time, and formally mediatized.