But that get's me thinking, I wonder if the Arab expansion after Muhammad can be seen in the same way as the pattern of nomads coming to conquer settled peoples. I don't know much about Arab society at that time, but I think they were mostly nomads (in the desert and semi-desert parts of the peninsula at least), so maybe they had a the ability to summon a similarly high proportion of their population for warfare (i.e. like 20% to 25%), which would go a long way in explaining why they were able to so swiftly defeat 2 much larger and well established empires (Byzantium and Sassanid Persia). The only expiation I've heard before is that they were just so religiously fanatically that they had a much higher moral then their opponents (which may be somewhat true, but on it's own still doesn't explain how they could be quite so successful).
Yes, the Arab expansion could be seen in this view. I would usually bee careful with statements on why a particular group of nomads started to raid an agricultural society as we usually lack the data to explain it. The Arabs and the Mongols are however IMO two exceptions since we have at least some knowledge about the events that happend before their expansion. In both cases we have a group of people with strong traditions of raiding their neighbours. Usually those neighbours were a different tribe/clan from within these groups. In both these cases a unification leaves the tradtional raiding targets out of limit, which means that they have to seek new raiding targets. In the case of the Mongols that happend to be the Chinese and other settled people, and for the Arabs it was the Byzantine and Persian empires. In both cases the resistance to the raids turned out to be weaker than they had expected and the raids turned into conquest. The success is IMO not so much because of how large part of the population they could put under arms (although it's important), but because what gagenater said, they could hit and run because of their mobility. They could also withdraw into territory where it were close to impossible for civilised armies to follow, making it more or less impossible to engage them if one were in a superior position. The arabs could withdraw into the desert and the mongols into the steps. Neither is a place where you easily can take a large army without a lot of preperation, and if one did the enemy could simply scatter into 100 small groups.
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