Quote Originally Posted by Tuidjy
I think that retraining should lower the experience, but that the recruits
should not start at rock bottom. The unit spends a whole turn in the castle,
and the veterans could and probably would take an interest in the fresh meat.

If it were up to me, I would have the recruits with half the experience of
the veterans. This way, there would be a drop in the overal unit experience,
and heavy casualties would matter, but one would still have a chance to
develop and maintain elite units.
That I think is the an excellent idea.