John W. Fleming/Flemming was born ca 1841 in Virginia. By 1845 his family had moved to Fairfield County, Ohio. He was listed with his parents in the census of 1850 & 1860 Bloom Twp, Fairfield Co. March 14, 1861 in Fairfield County he married Mary S. Mumaugh who was born about 1841, probably in Fairfield County, Ohio.
I have not been able to find either John or Mary after their marriage except for several Civil War enlistment records via Ancestry.com. They do not seem to show up in the 1870 census. Mary's siblings moved from Fairfield Co, Ohio to Indiana; Pickaway Co, Ohio; Darke Co, Ohio and VanBuren Co, Michigan.