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europe is just densely packed and highly populated. While external surrounding land is expansive and has a population that is just sprawled out in whatever nomadic pastoral tribal pursuits. Basically the nomad lands are recruitment grounds and europe is built for being raided upon by massive warparties of savage horse riding barbarians
and just like the eastern nomads of old who harassed imperial china endlessly, I must harass the europeans with incursion upon incursion from all sides until they are bled completely dry
to stagnate and not go the way of the horse is to be complacent and fat like the european, thus a mistake and a grave one at that because the savage nomad is one of the most merciless people on earth