Thomas Jefferson Mercer
born 12 February 1836 Calais?, Somerset Township(?), Belmont County, Ohio
(1840, 1850, 1880 census say born Virginia)
died August 29, 1911 West Point, Mississippi

father:
*Thomas Mercer
born 31 May 1800 Chester County, Pennsylvania
(1840, 1850, 1880 census say born Virginia)
died 14 March 1879 Pike County, Benton Township, Ohio

mother:
*Fannie Frye
born 1804 Virginia
died between 12 February 1836 and 10 June 1838
married 1825

siblings:
a.Rebecca Mercer
b. Joseph Mercer
c. William Mercer
half-brothers and sisters:
e. Sarah O. Mercer
f. Mary M. Mercer
g.Louisa Mercer
h.Jerimiah Mercer
i. Martha Mercer

spouse:
*Amanda Melissa Stephen
born 2 October 2, 1841 Belmont County, Ohio
died 29 November 1924 Bridgeport, Lawrence County, Illinois
buried Solsberry, Green County, Indiana
married 8 May 1859 Noble County, Ohio

children:
a. John Mercer, b. 1860, d. 1882 in Kentucky
b.Campsadella Mercer, b. December 25, 1862, d.
c. *Julia Alberta Mercer, b. March 9, 1866, d. June 10, 1906
d. Emma Mercer, b. January 26, 1868, d.
e. Horrace Mercer, b. April 28, 1870, d.
f. Oliver Perry Mercer, b. January 28, 1872. d.
g. Frank R. Mercer, b. September 22, 1873, d. 1948
h. Sadie Mercer, b. 1875, d. quite young
i. Louella Mercer, b. January 24, 1877, d. March 1974
j. Bertha Mercer, b. September 15, 1881, d.

background:
*Thomas Jefferson Mercer wrote his own genealogy and put *Fanny Frye as his mother.
He makes no other mention of her again. My speculation is that she died in childbirth- perhaps with him.
The date I have for her latest possible demise is the marriage date of Thomas Mercer to her sister Eliza Frye.
One would think there would be a decent interval after her death before he married her sister.
In which case it may well have been at the time of Thomas Jefferson Mercer's birth.

From the last days of September through October 1863, Gen. Braxton Bragg’s army laid siege to the Union army under Maj. Gen. William Rosecrans at Chattanooga, cutting off its supplies. On October 17, Maj. Gen. Ulysses S. Grant received command of the Western armies; he moved to reinforce Chattanooga and replaced Rosencrans with Maj. Gen. George Thomas. A new supply line was soon established. Maj. Gen. William T. Sherman arrived with his four divisions in mid-November, and the Federals began offensive operations. On November 23-24, Union forces struck out and captured Orchard Knob and Lookout Mountain. On November 25, Union soldiers assaulted and carried the seemingly impregnable Confederate position on Missionary Ridge. One of the Confederacy’s two major armies was routed. The Federals held Chattanooga, the “Gateway to the Lower South,” which became the supply and logistics base for Sherman’s 1864 Atlanta Campaign.
http://www2.cr.nps.gov/abpp/battles/tn024.htm