Sedentary people have become used to laziness and ease … They find full assurance of safety in the walls that surround them, and the fortifications that protect them. The Bedouins have no gates and walls. They always carry weapons. They watch carefully all sides of the road. They take hurried naps only … when they are in the saddle. They pay attention to every faint barking and noise. Fortitude has become a character quality of theirs, and courage their nature.Ibn Khaldun, quoted in 1453 by Roger Crowley
As preparation for the Turks laying siege to Constantinople.
This was more or less Robert E. Howard’s view of Cimmerians in the Conan books, wasn’t it? The advantage the uneasy savage has in finding a city fat and sleeping.