After Pułtusk Łubieński was awarded the Légion d’honneur and in 1808 he fought at Somosierra, supporting the final phase of the assault. He and his regiment fought in the Peninsular War before he returned to Paris in January 1809. On 5 April 1809 he received the cross of a Grand Officer of the Légion d’honneur. In the 1809 campaign he fought at Essling on 22 May and Wagram (6 July) and to reward his courage Napoleon made him a Baron de l'Empire with a pension of 4,000 francs, later increased to 6,000 francs. In 1810, a few months after retiring to Warsaw, he received the order of Virtuti Militari. Following a disagreement with the regiment's commander, Krasiński, Łubieński was dismissed. At the start of 1811 he was sent to Segan with the Legion of the Vistula ("Legia Nadwislańska"), one of the largest Polish foreign legions of the Napoleonic era, which was renamed the 8th Uhlan Regiment ("8éme régiment de Uhlans"). In March 1812 Łubieński led his regiment to Berlin, Grudziadz, Wystruć, and Vilnius to fight in various Polish campaigns.