the century - fighting unit

[L C Cinna]

he clearly uses names usually used for auxiliary units

Who says they're reserved for auxiliary units?

And don't be so over-sensitive. No one was attacking you.

yes sorry. hope you accept my apology I was a bit...well not the best day yesterday.

You are right about the names but the numbers still seem a bit strange to me. I've checked Junkelmann now and the numbers for cavalry given by Vegetius in the quote above seem too low for a cohors equitata.

Vegetius:

• 1105 infantry and 132 armoured cavalry for a cohors miliaria
  
  
  555 soldiers plus 66 cavalry for a cohors quingenaria
  

Junkelmann:

• circa 800 infantry plus 256 to 320 cavalry for a cohors equitata miliaria
  
  circa 480 infantry and 128 to 160 cavalry for a cohors quingenaria equitata

on the other hand if we take Vegetius numbers we'd come up with a legion's strenght of

6100 infantry and 726/730 cavalry

this seems way too much cavalry for a legion imho. The usual number given is around 120 legionary cavalry.

So I'm just wondering what he's talking about? A strenghtened legion? legio equitata? In this case I'm wondering when such a setup was common or came into use? late 2nd early 3rd century?