The fifth expedition of the Somaliland campaign in 1920 was the final British expedition against the Dervish forces of Diiriye Guure and his his emir, the religious leader. Although the majority of the combat took place in January of the year, British troops had begun preparations for the assault as early as November 1919. The British forces included elements of the Royal Air Force and the Somaliland Camel Corps. After three weeks of battle, Diriye Guure's Dervishes were defeated, bringing an effective end to their 20-year resistance.