As I recall, most decent Celtic units are more expensive than the Roman counterparts, which accounts for a bit of that; there aren't enough of the good soldiers to fight their equivalents, due to their cost. Mind Romans did have trouble with actual soldiers in Celtic territories, as opposed to levies-augmented-by-soldiers that Julius Caesar had to fight (as the Gallic armies were so worn down by fighting between the Sequani {who's royal house taken control of the kingdom the Arverni had built} and the Aedui Confederacy). Most Gallic soldiers in those days would've probably been spearmen, incapable of raising 'regulars', who the Neitos represent. Mail-equipped companies of Gauls were trouble for the Romans, but most were spent retarding the Germanic expansion or fighting eachother; had they been spent against the Romans, it may have been at least a bit different, at least slowing the conquest of Gaul.
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