Turning a battlefield into a dungeon crawl in lieu of a mass battle system is 11/10. Absolutely love it.
Viewing post in Rakehell: The Battlefield comments
I find most Mass Battle systems to feel detached from the core mechanics of systems they're affixed to; or they relegate the characters to command positions which aren't as dangerous/fun or cause the scenario to dictate the command are leading the fight from the front for some reason.
I think with some time to clarify/broaden things/provide enough examples, this type of scenario could be more broadly useful. Glad to hear you like it!