Well now this is interesting: UNBOUND. Rules for large scale battles.

UNBOUND is a system for large-scale WARMACHINE and HORDES battles in which players each field 150+ point armies with three or more warcasters/warlocks. It is more of a new way to play WARMACHINE and HORDES than it is a truly new system. It uses the same models and mostly all the same rules. Rather than just an escalation in scope, UNBOUND is a retooling of the WARMACHINE and HORDES systems that provides a truly unique play experience.

Throughout UNBOUND games, you and your opponent take turns activating portions of your armies, rather than the entire army each turn, giving you the chance to react to their opponent’s moves and keeping you both engrossed and focused on the game with little downtime. We wanted to bring massive battles to the tabletop without the massive waiting between turns.