During the Napoleonic Wars, the Kingdom of Algiers had greatly benefited from trade in the Mediterranean, and of the massive imports of food by France, largely bought on credit. The Dey of Algiers attempted to remedy his steadily decreasing revenues by increasing taxes, which was resisted by the local peasantry, increasing instability in the country and leading to increased piracy against merchant shipping from Europe and the young United States of America.

In 1827, Hussein Dey, Algeria's Dey, demanded that the French pay a 28-year-old debt contracted in 1799 by purchasing supplies to feed the soldiers of the Napoleonic Campaign in Egypt. The French consul Pierre Deval refused to give answers satisfactory to the dey, and in an outburst of anger, Hussein Dey touched the consul with his fly-whisk. Charles X used this as an excuse to initiate a blockade against the port of Algiers.

The invasion of Algiers began on 5 July 1830 with a naval bombardment by a fleet under Admiral Duperré and a landing by troops under Louis Auguste Victor de Ghaisne, comte de Bourmont. The French quickly defeated the troops of Hussein Dey, the Deylikal ruler, but native resistance was widespread. The invasion marked the end of the several centuries old Regency of Algiers, and the beginning of French Algeria. In 1848, the territories conquered around Algiers were organised into three départements, defining the territories of modern Algeria.