from disease and less than 3 percent of those killed in battle. Losses among African Americans were high. In the last year and a half and from all reported casualties, approximately 20 percent of all African Americans enrolled in the military died during the Civil War. Notably, their mortality rate was significantly higher than that of white soldiers. While 15.2% of United States Volunteers and just 8.6% of white Regular Army troops died, 20.5% of United States Colored Troops died. The United States National Park Service uses the following figures in its official tally of war losses: Union: 853,838 110,100 killed in action 224,580 disease deaths 275,154 wounded in action 211,411 captured (including 30,192 who died as POWs) Confederate: 914,660 94,000 killed in action 164,000 disease deaths 194,026 wounded in action 462,634 captured (including 31,000 who died as POWs) While the figures of 360,000 army deaths for the Union and 260,000 for the Confederacy remained commonly cited, they are incomplete. In addition to many Confederate records being missing, partly as a result of Confederate widows not reporting deaths due to being ineligible for benefits, both armies only counted troops who died during their service and not the tens of thousands who died of wounds or diseases after being discharged. This often happened only a few days or weeks later. Francis Amasa Walker, superintendent of the 1870 census, used census and surgeon general data to estimate a minimum of 500,000 Union military deaths and 350,000 Confederate military deaths, for a total death toll of 850,000 soldiers. While Walker's estimates were originally dismissed because of the 1870 census's undercounting, it was later found that the census was only off by 6.5% and that the data Walker used would be roughly accurate. Analyzing the number of dead by using census data to calculate the deviation of the death rate of men of fighting age from the norm suggests that at least 627,000 and at most 888,000, but most likely 761,000 soldiers, died in the war. This would break down to approximately 350,000 Confederate and 411,000 Union military deaths, going by the proportion of Union to Confederate battle losses. Deaths among former slaves has proven much harder to estimate, due to the lack of reliable census data at the time, though they were known to be considerable, as former slaves were set free or escaped in massive numbers in an area where the Union