![](https://www.historynet.com/wp-content/uploads/2017/08/Mullah-2000_577.jpg)
De Havilland D.H.9s of the RAF’s Z Unit line up for a mission against Mohammed bin Abdullah Hassan, who had defied British colonial authorities in Somaliland for two decades. (RAF Museum, Hendon)
De Havilland D.H.9s of the RAF’s Z Unit line up for a mission against Mohammed bin Abdullah Hassan, who had defied British colonial authorities in Somaliland for two decades. (RAF Museum, Hendon)