The Attrition Rate in the Battle of Bull Run

It was only after the appointment of doctor jonathan letterman to the post of surgeon general of the army that a standardized ambulance response began. He organized soldiers into response teams to carry wounded to a site where they then could be transported to field hospitals, or even further on into general hospitals. And also demanded that hospitals be clean establishments, which was before be we knew about bacteria. So his approach ended up saving a lot of lives.