In the course of the US civil war how did tactics change

Many historians suggest that the early American civil war they used the Napoleonic tactics. They utilized this tactics mostly in battle even though the weapon they had was capable of more advanced tactic. During the encounter and in the battlefield, their men would be in a tight formation, soldiers close with one another (elbow-to-elbow formation). Moreover, Guelzo asserted than within 600 years the guns they had during their time was apt but because of the smoke released by gun, soldier’s visibility would be at risk. Hence, even though technology and weaponry was developing the generals in the civil war never minded using alternate tactics instead they stick into what’s traditional. The usage of skirmishes was utterly significant instead. They were practical and improving methodologies and tactics in the field of battle and combat to combat exercises rather than tools of war - weapons.