Almost forgot - The Miniatures Handbook in 3E/3.5E also had rules to turn the skirmish game into a mass combat game, but it never got any traction or support. Also, Birthright had its own mass battle system, which was a hybrid card/board/war game. And there's DL11 - Dragons of Glory, which was a wargame and Battlesystem roster combined.
I've been interested in table top battles ever since I got my copy of 1E battle system. Other than a couple initial games (my gnolls vs. other people using the chits...), I could never get my gaming group to play - even though some of them took up WHFB, Napoleonics, Battletech and the like.
For some reason, tabletop mass battles didn't seem to click with RPG play. I've picked up a variety of additional systems over the years (WHFB, Runewars, Kings of War, Dungeon Command, Chainmail (2001), Age of Sigmar, D&D Minis Skirmishes, D&D Attack Wing - and that's just the fantasy games) and nothing has really stuck with me. A lot of times, I've found that those that play RPGs aren't interested in mass battles, and those that are interested in mass battles don't do RPGs or aren't willing to tie them to an RPG game. It's confounding as a DM.