Quote Originally Posted by Titus Marcellus Scato View Post
Depends on the enemy the Parthians were fighting too. An all-cavalry army makes sense when you're fighting Scythian steppe nomads, all of them mounted. This can be done because steppe nomads rarely assembled really big armies, raids were far more common.

Against the Baktrians, Seleucids, or Armenians, however, infantry can be the main bulk of the army (although cavalry remain the arm of decision.)
Do you know this for a fact? Or is it just speculation?