Epic Fail

The Roman Empire spent a great deal of effort and money building Hadrians Wall.  All that man and mule power hauling those big stone blocks up hill sides that we find it hard to manage with just the weight of ourselves and a light rucksack.

And in its primary goal, keeping out hairy unkempt dimwitted natives?

Epic Fail.

Note: one possible source of the word "barbarian" is that ancient Greeks thought people speaking other languages sounded like they were saying "baa-baa" or something akin to that.  Coincidence?  I think not.