I don't think anything of the sort was claimed. Rather the argument is that by the time the German tribes started seriously encroaching on Gallic and Celtic central regions they had a relatively smooth sailing for the exact same reason as the Romans - their opponents were weakened by centuries of internecine strife (above and beyond the tolerable attrition level imposed by the tradition of minor inter-tribal raiding and fighting inherent in the Celtic "hero culture") whereas the invaders had only grown stronger, in the case of the Germans quite literally at the expense of the Celts.Originally Posted by SaFe
The border regions moreover would have long been subjected to slowly escalating German raids which would have taken their toll on the power of the locals (and the spoils and tribute only further strenghtened the raiders), until they had become sufficiently weakened genuine invasions and seizing the fortified places became a viable outgrowth. Medieval warfare in fact followed a very similar "wearing out" model, as did the more permanent Viking encroachement - you usually couldn't capture the forts, so instead you hit the other guy's economic base and thus wore down his ability to offer resistance in the future.
This would be a rather normal developement; the Anglo-Saxon invasion of Britain more or less got started the exact same way, and both the Romans in Gaul and Moors in Iberia originally came in to stick their noses in local power struggles. In this specific case not only had the Germans grown strong literally at Celtic expense - as succesful mercenaries were able to get that much better war gear and even spread it around thereby aquiring minor personal warbands with the obvious potential for massive "snowballing" - but also gotten the figurative foot in the door in the course of their mercenary activity, as well as doubtless having gotten a good long look at just how much richer lands their Celtic paymasters occupied with the obvious implications...About those mercenaries( who turned out to be rather clever, as the just stayed in those new lands aftr defeating the gauls). At this time they were already just over the river border - becaue of conquering celtic lands for many decades.
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