[Chazar]

I've recently verified in 2.14 that stealth commanders can lead non-stealth units out of currently sieged castles: 1.Remove troops from stealth leader, 2.give sneak order to stealth leader, (2a.change to move via menu), 3.add troops again. The troops move like normal, ie. they do not participate when the castle is stormed. This works at least with flyers, but I think stealth is the key here.