But every example about how civil war armies were better on defense is about intrenched defenders (even if only field intrenchments). The weaponry was more deadly than it had ever been before (hence, generals steeped in Napoleonic tradition, didn't get it) but the firearms were still not that reliable or accurate. That is how Pickett's charge was even as successful as it was. Very few were falling except to artillery until after they crossed the road. Grant caught hell for not intrenching at Shiloh when he was almost driven into the river. The Killer Angels was a wonderful book but I have seen others that are skeptical about whether Longstreet was all that prescient. When he was in charge, in Tennessee, he did much the same thing Lee did (with much the same result). Perhaps the defense should also get a bonus when the attacker is coming from an open space (plains or grassland). When you walk the field at Gettysburg, the impressive thing is not how high the hill is (the slope is actually less than the triangular field by the Devil's Den) but how open it is. That the Confederates even tried to attack Little Round Top is largely because the Union hadn't occupied the place long enough to build breastworks. My only point is that the power of the defense is in the fortification (and other modifiers, like elevation). And from about 1600 to 1917 (and often enough after that), the attacking force was ALWAYS infantry--and sometimes, particularly against an unintrenched enemy, they won. But, in the context of the game, of course, it doesn't make any difference, because if you want to attack in those times you use cavalry even though nobody in the real world ever did (er, except my mistake, half a league, half a league, half a league onward!)