To enslave them or not?

[Ludens]

So the number of slaves doesn't affect the number of people rebelling when there's a rebellion then? I assume so. Thanks a lot.

No. It is just another way of putting the "execution" command when crushing a rebellion.

If you enslave them they cannot get away. However if you let them be ransomed they can go back to their former armys thus being able to attack you again. See what i'm saying? Keep them.

You only ransom your enemies when they are belonging to a faction, not the rebels. Mind you, if you don't kill rebel prisoners before the battle ends, their lands will be confiscated, which brings you money without returning the soldiers to the enemy. So it is better to leave them alive: pressing the kill button will cost you money.