Some U.S. Civil War stats (courtesy
http://www.civil-war.net) --
Killed and Mortally Wounded: 110,070 (31%)
Died of Disease: 199,720 (56%)
Died as Prisoner: 24,866 (7%)
Died from Accidents: 9,058 (3%)
Died from all Causes
except Battle: 15,814 (4%)
Total Deaths: 359,528
[percentages are rounded]
Looks like if your number was going to come up in this conflict, you had a 56% chance of dying by disease. Your odds of dying by battlefield wound weren't much better...