Just got this on Steam (only $15)!
Ultimate General: Gettysburg is a Civil War real-time strategy game that meets one of the classic criterion: easy to learn, hard to master. It’s not as intimidating as most wargames I’ve tried – the controls are quite simple, just point and click. Then again, your artillery’s going to do better on high ground, and your infantry’s going to last longer if it’s firing out of cover (like woods).
Here’s a pretty good “first impressions” video: