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 During the last days of the Western Roman Empire and throughout the Middle Ages, Western Europe was threatened, and often invaded, by outsiders. First came the Huns, then the Arabs, then the Magyars, then the Vikings, then the Mongols, and then the Turks. Each in turn, they were described as ferocious warriors none could withstand. Each in turn, their hordes inflicted immense bloodshed, destruction, and suffering on a continent rendered almost defenseless by the prevailing socio-economic-political structures and the internecine struggles to which it led.

- From Pussycats: Why the Rest Keeps Beating the West and What Can Be done About It by Martin van Creveld