Only on their own turf, ie in woods. Otherwise, endless stacks of Luso (where do they get them from?) or AS is much worse.
But as I and others hav said, maintain a navy. As Rome I usually have three- four main fleets composed of one-two of the biggest Romans can build and 2-4 covered Liburnians. An Eastern and Western Fleet and a Central Fleet for reinforcement, and when the time is ripe, an Atlantic one as well. Then a few Covered or open Liburnians to ferry troops around. Even when your enemies are vanguished on the seas, pirates should still provide enough for them to do, and blockades.
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