Voxdalian
Recruit
I don't know if this is the case for all cavalry units, I only know about the Imperial Equite.
When upgrading them to Heavy Cavalry they need a warhorse instead of a regular horse, so the upgrade consumes one, but it doesn't give back the old horse. There is some historical realism to this, but gameplay wise it would be much more manageable if you could recycle the regular horses to reuse them for the next batch of cavalry to be trained.
Either way is fine, but it could be an idea to think about.
When upgrading them to Heavy Cavalry they need a warhorse instead of a regular horse, so the upgrade consumes one, but it doesn't give back the old horse. There is some historical realism to this, but gameplay wise it would be much more manageable if you could recycle the regular horses to reuse them for the next batch of cavalry to be trained.
Either way is fine, but it could be an idea to think about.