Couple people asked – in mass combat, a solo attacks a stand using a normal attack. Rules assume solo is making lots of attacks.
— Mike Mearls (@mikemearls) March 2, 2015
Think of Legolas, Gimli, or Aragorn slicing through orcs in the big battle scenes in the LotR films.
— Mike Mearls (@mikemearls) March 2, 2015
@GX_Sigmawhat about stands attacking solos? 100 attacks per round? check out the rules for isolation – that covers the drawbacks for fighting on your own or while isolated from allies.
— Mike Mearls (@mikemearls) March 2, 2015
Sage Advice you can download Mass Combat Rules for Dungeons&Dragons here:
http://dnd.wizards.com/articles/features/unearthed-arcana-when-armies-clash