Line of Muskets is designed to put you in the "seat" of a general during the American Civil War. You have to make the same strategic and tactical decisions that the generals in the civilwar battles had to make. Keeping a solid line of troops is good, concentrating your artillery fire is good, ripping your opponents flank apart is good. Of course, things like leaving a hole in your line is bad. Letting your opponent outflank you is bad.