How did the Rif War delay French control of Morocco?

The Rif War delayed French control of Morocco by forcing France to abandon its initial, more cautious policy of indirect rule in favor of a full-scale military intervention alongside Spain.1

Initially, the French resident general, Louis-Hubert-Gonzalve Lyautey, sought to limit the conflict through subtle, calculated military moves and political preparation. However, in April 1925, Abd el-Krim expanded the war by sending his forces into the French protectorate. These fighters caught the French off guard, overrunning dozens of frontline positions, inflicting approximately 6,200 casualties, and threatening the major urban centers of Fès and Taza.12

This crisis forced the French high command to replace Lyautey with Philippe Pétain in late 1925. Under Pétain, France shifted to a policy of direct, joint military action with Spain. The subsequent coordination of massive French and Spanish forces eventually overwhelmed the Rifian resistance, leading to the surrender of Abd el-Krim in May 1926 and the eventual consolidation of colonial control.12