IronWolf
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I wouldn't try to dictate the game so strictly.. if they want to split up the party, let them face the consequences, good or bad.
I agree. Let the characters do what they want. If that means the strategy is to send the paladin in and *then* try to sneak around, they will learn quickly that they might need to adjust strategy. For example, maybe they will switch to the scenario of scouting the situation out stealthily and then tell the paladin, wait here for three minutes, unseen in the hall while we sneak around to the back. This allows the party to have a chance to play the tactics they want without sacrificing the paladin.
I think it is great they want to use some stealth to turn encounters to their advantage. They just need to learn to do this tactically and realize the paladin won't survive if he is seen and then they start these stealth moves.