^ I think it was established that Remans were used as shock troops - but it was during the Dominion War.
Yes, but it makes sense that they were also used in the same capacity in the Romulan War as well. I mean if the Romulans are an "Empire" then they should have slave races, and slave races can be used as soldiers for the Empire if they didn't want the enemy to see what they looked like.
Of course, if they had actually done that in ENT the canon-nutters would have been endlessly howling their guts out over how "TOS never explicitly said the Remans were used as soldiers! Horrific canon violation!".