Continueing Nomadic disruption.

Throughout recorded history Europe has been affected by the periodic movements of the Step Nomads, either by them driving existing populations before them or direct invasion. These events stopped soon after the widespread adoption of hand held firearms. What would have happened if the Horse bourn nomads had kept coming?
 
Coming from where?
There's a demographic limit for each nomadic invasion and all the population surplus (that couldn't live on a given land because too few agricultural production by exemple) isn't infinite.
 
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