
Originally Posted by
Angadil
The Roman army at Carrhae was anything but well-rounded. It was defficient in missile troops and, possibly, cavalry, particularly for the task it had ahead of it. Additionally, would you care to please present *clear* evidence of Parthian, or Sassanian cataphracts *frontally* charging formed Roman infantry and breaking it? Simply an account of a Sassanian (or Parthian) victory doesn't qualify. We need detailed descriptions. I've gone through the sources to some extent myself (ironically, because I wanted to prove that cataphracts did what you claim they did, but I couldn't...) and I've found quite hard to come by unequivocal examples of cavalry, cataphracts or not, successfully charging half-decent infantry that was still in good order. Or even attempting it. The closest I think I've come is actually the battle of Magnesia, where the Seleucid cavalry Agema and cataphracts led by Antiochos III *might* have broken a roman legion in the interpretation of some scholars (mind you, this is a pre-marian legion, though one most likely made of hardened veterans from the Punic Wars). However, Livy's account of the battle speaks of a flanking manouver and, maybe, of Galatian infantry supporting the cavalry charge. So, I am honestly intrigued by that "well documented" statement.
Additionally, some people seem to think that cataphracts evolved as a sort of response of the "horse peoples" to fight heavy Hellenistic or Roman infantry. That is wrong. There is reasonably abundant evidence for heavily armored cavalry that predates the encounter of the "horse peoples" with enemies rich in heavy infantry (Khumbuz-tepe teraccotta from Khorasan. Xenophon's descriptions of some Persian cavalry. Arrian's comments on Saka cavalry. Archaelogical finds of horse armor in Scythian and Saka contexts, etc...) In fact, the cataphracts seem to have appeared among peoples that faced lots of horse archers. Think about it for a second: cavarly is quite vulnerable to missiles, so protecting horses is a quite likely development in an "arms race" between horse archers or more, generally, in an area where bow use is very widespread.
To sum up. The historical usage of the HA+cat combo against heavy infantry seems to have relied on splitting them up and then using the cavalry's greater movility to successively gang up on isolated units. That is what the battles for which we have more detailed accounts seem to suggest. IIRc, in the game isolated units also rout quite more easily. Finally, Parthia should also have a couple of reasonably heavy cavalry units that carry bows too.
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