When was this? I know nothing of this. Interesting.
The Sacred Band was said to be equally well trained as the Spartans.
About armenians... well, unless we can create some sort of mounted crossbowman, I really suggest we don't go down that road. The horse was always the military unit the Armenians were known for, and there seems to be literally no reference to any kind of archery unit at all in the Armenian Military History page on wiki, so I say horse at least is a must.