During the Napoleonic Wars he fought with distinction in several campaigns. During the war against Prussia he took part in the battles of Świdnica, Glogau and Neisse. On 1 July 1807 he was again promoted, this time to the rank of podpułkownik (lieutenant colonel). In that rank he joined the Vistulan Legion and became the commander of the cavalry of that unit. With his men he took part in the Peninsular War and fought in the battles of Mallen, Alagon, Epila and Tudela. In the summer of 1808 he fought in the First Siege of Saragossa. Following the Siege of Valencia he was awarded by Marshal Louis Gabriel Suchet with a private audience with Napoleon Bonaparte. The Emperor granted him a yearly reward of 2000 francs and a promotion to colonel. Considered a hero, in 1812 Klicki was made a Baron of the Empire.