Loss of blood from rifle shot and canon ball shrapnel , plus gangrene ,dehydration and scurvy. would be my guess.
the civil war
lead.
Most experts agree somewhere between 620,000 to 700,000 deaths from the civil war.
If they weren't killed by soldiers on the opposite side, they were most often killed by their wounds getting infected. Also, many died of dysentary and measles.
The Civil War
Most of the common diseases that killed troops on both sides of the American Civil War include dysentery, malaria, pneumonia, measles, typhoid and tuberculosis. The worst out of the bunch was by far dysentery. This one disease accounted for around 45,000 deaths in the Union army and around 50,000 deaths in the Confederate army. The diseases that killed the soldiers were malaria and small pox.
Approximatel 620,000 soldiers were killed during the American Civil War. There are no accurate figures of the number of civilians killed.
Dysentery killed most soldiers in the Civil War.
Union had more soldiers in the war.
American Civil War
Infection
How many numbers of Union soldiers killed in the civil war