Get more missiles, you want a high attack value and lots of ammo. Then fight a battle of manoeuvre. Attack their army on the strategic map, so they will wait for you rather than coming at you on the tactical map. Send in skirmishers and cavalry feints to pull their army out of shape (not actual attacks), and lure off units one or two at a time then mob them. Lure their cavalry onto your spears.
Once your slingers/skirmishers can roam free without fear of cavalry etc, start long flanking moves to put them behind the nudists. If they turn to face the missiles, move some cavalry up close to them (without fighting) to get them pointed back the way you want. Then fire away, you won't see much effect at first as you take the first hitpoint but after a while they'll start dying like regular celts.
Do the closest thing you can to horse archer tactics, basically.
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