The Celtic Diaspora

They appeared four thousand years ago, from the steppes somewhere north of the Caspian, moving constantly westward with their animals and carts. Never stopping long enough to build towns or cities; unusually quarrelsome, their warrior culture seemed mostly to be an internal affair, tribe versus tribe. Until they met with an expanding Rome, still forging it’s fearsome battle tactics. This was a war that only one could win. But which one?