As with a lot of things that aren't legal but don't really hurt anyone, it's highly unlikely that anyone would bother you if you download a cracked version for personal use, used GameJackal or some other cracking software, or whatever. They would have a hard time convincing anyone that you're worth prosecuting even if they found out, since you did buy the game and aren't cutting in to their profits. Obviously if you're stealing the software things are different (and that's not only illegal but also, I think, morally wrong as well).
If you're worried about the long arm of the law invading your bedroom (or office?), there's still a totally legal way to do what you want. If you don't have Warlords, you can buy Warlords from direct2drive.com. You won't need to use the original game CD anymore once you install the direct2drive version. That's what I did, and I've been very happy with this solution.