Well, you can go out and hire yourself a harem pretty much at will...
I can work in some major battles if you'd like, but I think I'll have to come up with some homebrew rules for it. WAAAAY back in 2nd ed. I ran some mass combats using the 2e core rules as the base, and I think they went really well. That set of rules was a bit more abstract, however, and having the main adventurers mixed in with the armies didn't cause any problems.
4e is so focused on small skirmishes it might be difficult to meld the players and their armies together and have them mesh in meaningful ways, but I'll give the matter some thought.
Anyway, fighting one huge creature isn't too hard a thing to bring into the game. That I can manage easily, I think.