I once walked around with an army of 5 gaesatae and nothing else. I took out an army of 25 lugoae and 2 other not so poor units (obviously some were reinforcements), in a very close battle where I only had left slightly more than one unit. It was in an intermediate version where I was creating the money script for the freemen, and it gave way too much money to them, so they spammed levies like crazy. But it goes to show that those naked guys can chew up nearly any amount of weaklings.