The Rhyfelwyr are recruitable in Attuaca in the town, so I would be able to train them.

Is there another Casse unit that would be more effective as my main infantry force than either Boatroas or Rhyfelwyr? I fought some spearmen today in Ireland that looked pretty tough, but they're much less mobile and don't have a javelin attack, so I'm not sure how to quantify them.