Why were casualties high during the civil war?

Answer 1

Most men died in the Civil War because of disease, but the battles had high casualties because of many reasons like more accurate rifles due to rifled barrels and bullets and the large ammounts of men fighting in the battles.

Many people will say its because they fought in lines and fired back and forth but actually this was only used allot at the start of the war but later many marched into battle in formations but the battles were so chaotic that the formations came apart and men fought from cover all over the place. Also many battles had high casualties because they would many times charge the defenders trying to break the defence and push the defenders back which didn't work well.