What of Sertorius in Hispania? Look at the bloody nose that Caesar got when he tried invading Britain - even after diluting the power of Cassivellaunus. Look how close he came to defeat by Ariovistus - saved only by the timely intervention of one of his legates; and again at Alesia. What about Crassus in Persia? What of the three legions that marched into Germany and never came back?
Roman military might was oly one tool in the Roman tool-box. A very good tool, but rarely used on its own. Can't defeat an irritating rebellious general? Get him assassinated. Don't want to face a half a continent of barbarians under one flag? Make alliances of various natures with them and play them off against each other....
Rome didn't become the predominant force in the West by simply shouting ug and killing lots of people; having a great army will get you so far; having the reputation of a great army, the political/diplomatic nouse to play your enemies as if they are allies.... that gets you a whole lot further.
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