Battalion Nemesis is a military themed turn-based strategy game. (Be warned, it only works on that site in fullscreen mode.)
Supposedly, it's based on some old game called Advance Wars, which I have no familiarity with at all.
I can tell you, though, that it's a generally amusing and entertaining game, if occasionally repetitive. I'd recommend it.
I'd say more, but I've got little time for it at the moment.