memory as closely to the conditions that they lived in and worked in. >> reporter: the reenactors strive for authenticity. >> if they were to come back to life and walk through the camp, there would be nothing they could not identify. >> reporter: they do have their limits. few in-dudulge in salt park. >> we don't need to experience dysentery to enhance our experience. but. >> reporter: even the reloading of a musket helps one sense the scale of carnage here. >> a good soldier can do it in about 30 20 seconds. >> reporter: when the 50 minute long charge ended, 6800 men laid dead or wounded. the next day, the fourth of july, confederates went south into virginia. the wagon train carrying the