Tbh, i find mounted skirmishers such as Cavalry Auxilia/Milita Cavalry/Numidian Cavalry/Early Eastern Generals etc useful against elephants, as they are cheap to raise and upkeep. Elephants have no chance of catching them - instead you have to deploy light cavalry of your own to drive them off the field.
If you leave skirmish mode on, these javelin cav should always stay out of range of elephants and other units, whilst managing to get a few volleys into the target. Around 3 volleys should see elephants begin to fall, same goes with chariots. Problem is, these mounted skirmishers don't have much ammo, so you will need a few units of them to have any real effect on armoured targets.
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