Hit Alt-A.
Just kidding.
Actually it sounds like you did ok, getting a major. Taking the vets is a wise move, as they are less likely to break and run when you tell them to cross open fields under fire. I'm more in favor of using the sharpshooters in a defensive position, I don't know what the extra points would have got you. It sucks when they have guns with a wide scope of fire, at least you bought some arty, imagine if you didn't have any at all? Hang in there, you'll learn what to do in time.
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Don't shoot...let 'em burn! - from opening scene, SPR