What major victory did the allies of Chaumont achieve to end a war?
Campaign in north-east France (1814):  Following their victory at Leipzig (1813), Russian, Austrian and other German armies of the Sixth Coalition invaded France. Treaty of Paris (1814):  Peace talks had started on 9 May between Talleyrand, who negotiated with the allies of Chaumont on behalf of the exiled Bourbon king Louis XVIII of France.
victory at Leipzig