The Somaliland Campaign, also sometimes called the Anglo-Somali War, was a series of military expeditions that took place between 1900 and 1920 in the Horn of Africa, pitting the Dervishes led by Mohammed Abdullah Hassan (nicknamed the "Mad Mullah", although he "was neither mad nor a mullah") against the British. The British were assisted in their offensives by the Ethiopians and Italians.