Unit coherency.

Do henchmen groups have to stay in unit coherency? If yes, how close, and do they have to move charge shoot together? Thanks.

Nope! They are free to move, shoot, not shoot, etc, however they feel.

(Although, if your group uses the All Alone rules, it doesn't hurt to keep them within 6" of another model. The All Alone rules are "standard rules", but many groups forget to enforce it.)

SK got it right.

Henchmen groups are mostly a convenience factor to make managing your warband easier. Otherwise it may be necessary to have a roster with three (or four!) pages instead of two pages. There definitely are some rules that support / define the use of henchmen groups but how you use the warriors inside a battle is totally up to you and they do not need to stick together.

Thank you both. We did tink that was how it worked, but two of our group were convinced we'd read otherwise (but couldn't remember where).

Idea for someone to play with: What if there is a scenario that forces all alone tests every turn even if not in combat? Something like a creepy fog covered graveyard or something. Could be interesting, but I doubt it would do much other than add flair to a scenario.

I think that this is done in the Night in the Graveyard scenario.

And / Or lost on the swamps.