Finally, in 1840, he was nominated governor-general of Algeria, and early in 1841 he put into force his system of flying columns, a controversial but successful tactic known as "Razzia" at the time. His swiftness and energy drove back the forces of Abd-el-Kader from place to place, while the devotion of the rank and file to "Père Bugeaud" enabled him to carry all before him in action. In 1842, he secured the French positions by undertaking the construction of roads. In 1843, Bugeaud was made marshal of France, and in this and the following year he continued his operations with unvarying success. His great victory of Isly on 14 August 1844 won him the title of duke.