Remaining in reserve with the regiment commanded by marshal Nicolas Charles Oudinot, Łubieński and his men suffered heavy losses guarding the French army at the crossing of the Berezina. At the end of 1812, Łubieński returned to Warsaw to rest and in 1813 fought at Dresden, Kulm, Leipzig and Hanau. In January 1814 he was discharged by the French, becoming commander-in-chief of the Polish army. In that post Napoleon put him in charge of allotting salaries and subsidies to Polish soldiers. He received the Order of Saint Stanislas 2nd class. After the Russian takeover and as he could not agree with Grand Duke Constantine Pavlovich of Russia, he was relieved of the role of commander-in-chief in 1816.