Truman E. Pomeroy Jr. (b. 1840 – d. 1894-02-05) was born in Margaretta, Ohio to Truman Pomeroy Sr. and Martha Whiting Reed. He attended college in Adrian, Michigan in 1860 enlisting in the 1st Michigan Infantry, Company K, when the Civil War broke out in 1861. Captured at the first battle of Manassas and returned in a prisoner exchange, Pomeroy re-enlisted, first into the 18th Michigan infantry, company C (alongside his future cousin-in-law Elvero Persons, who also appears in this collection) and later into the 12th Tennessee Cavalry, seeing further action at the battles of Franklin and Nashville. In 1869, he married Mary C. Opdycke, with whom he had three children: Gertrude (b. 1870-06-16), Catherine (b. 1874-09-17 - d. 1898-05-05), and Daisy (b. 1878-01-07, d. 1956-05). Pomeroy worked as a miller, a farmer, and sometimes as a teamster in Norwalk and Milan, Ohio until his death in 1894.
The Truman E. Pomeroy Jr. family held strong ties to New York State, especially the western counties. Truman Pomeroy Sr. resided in Monroe County as a young man and later served as Town Clerk for Hartland, Niagara County, NY before emigrating to Ohio.