This question and the reception of my answer got me thinking about the usefulness of charms spells in combat. Their usefulness is quite different based on the situation and the specific spell.
- A few charm spells (like Charm Person) give advantage on the saving throw if used in a fight, not even worth trying.
- If you can use Suggestion on one of the two Ogres attacking, you basically won the encounter, not worth asking.
But if 12 Goblins are attacking, and you successfully get their leader under your influence, what should be the others behavior?
They can clearly see you wave your hands, utter magic words from 9 or 18 meters, possibly closer as the leader usually does not charge in the front. They have their own shamans, so spellcasting is nothing new to them. And their leader is telling them to stop attacking, which is quite out of his character. Their leader seems to be charmed.
How would creatures react, if their leader is obviously charmed? I guess a highly organized and militaristic race like Hobgoblins have protocols in place, but an average race?