Pretty much with the Calvary.  I recall seeing a Alt history where that's pretty much what happened since they'll need that Calvary.

But I just am going by what I want and not reality.  I heard fantasy RP with Romans in the OP and I get all this historical accuracy stuff.  It seems there's always more to learn with history and all this research will drive me crazy since I am horrible at research.  All this realism make me wonder how obsessive the Info on the two hundred years between the PoD and now is going to be.