What was the greatest cause of deaths among soldiers on both sides uing the civil war?

The greatest cause of death among soldiers during the Civil War was disease, accounting for about two-thirds of all fatalities. Poor sanitation, inadequate medical care, and the spread of illnesses such as dysentery, typhoid fever, and pneumonia significantly impacted troop health. Additionally, the limited understanding of germ theory at the time contributed to the rapid transmission of these diseases in crowded camps. Combat injuries were also deadly, but they paled in comparison to the toll taken by illness.