Well, Gaesatae have 120/60 men, and the experience is awarded based on amount of men in a unit vs amount of non-routing men killed (routing units have a 1/4 chance of being counted AFAIK). Other Gallic units usually have 240/120 or 200/100 men, so they need to kill more men to gain the same points. That and the fact that Gaesatae take very little casualties themselves.
Speaking of Gaesatae, I was was just fighting them yesterday in Bononia as Eperios and I had two levy phalanxes blocking off a street, one unit on top of another to maximise the density of pikes. So anyway, it was just two levy phalanxes, 109 and 103 men each (Large Unit Size), with two experience and a Blacksmith upgrade. And 2/3 of the starting Eleutheroi garrison of Bononia pushing my poor pikes. However, I was barely taking any casualties, as only the Brinhetin could push through my pikes. Then the general died. Mass rout ensues, and all but the unit of Gaesatae keep on fighting. A minute later, with no routing units nearby the blokes rout, having lost only 4 men out of 60. I was speechless. I had no elephants, and all of my other troops were far away from the battle, ensuring that the Gaesatae were not spooked by anything.
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