6, although the merc camel archer seems to have less ammo.
I used 4 horse archers last night to completely destroy a Seleucid army. They had 3 militia hoplites, 2 militia cavalry, 1 skirmisher, 1 44-unit general cavalry and I think 1-2 more units I can't remember. I lost quite a few due to carelessness but I still had almost 3 full units at the end. They don't seem to do the Parthian shot, though, when chased by light cavalry.
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