Growth of for-hire creatures

[maltz]

Hi,

I wonder whether the read-to-be-hired troops grow over the game.

For exampe, in the original castle I didn't notice the bowmen and swordsmen grow at all.
There is a knight tent in the same (first) region with some horsemen and knights. I wonder whether their number increases over time, too?
And by what formula if anyone happens to know?

If I hire out all troops of a certain type do they ever grow back?

Thanks.