Without more information, the correspondents in these letters cannot be definitively identified, as Company B, 6th Wisconsin seems to have included among its ranks more than one William Evans:

William Evans (A) was born in Pennsylvania in 1843. The 1860 federal census lists a 17-year-old Pennsylvania native named William E. Evans living in the Winnebago County, Illinois, home of Mathew and Nancy Evans. Also in the household are Samuel Evans, 26, and Mary J., 14. Listed next door is the family of 30-year-old Charles Evans. The 1863 draft registration for Iowa's Second Congressional District lists a 21-year-old William E. Evans as a resident of Boone County. In the 1885 census, Mathew and Nancy Evans appear as residents of Dickinson County, Iowa, living next to the families of Samuel and James Evans. Samuel Evans' obituary shows him to have been a resident of Okoboji (Dickinson County), Iowa. The family members mentioned in the documentary evidence seem to match with the names provided within the letters in this collection. According to the Annual Report of the Adjutant General of the State of Wisconsin (1865, v. 1), William E. Evans of Company B, 6th Wisconsin Infantry was killed in action at the Battle of Gettysburg, July 1, 1863.

William Evans (B) was born in New Town, County Wicklow, Ireland, on August 8, 1827. While still young, he moved with his family to Canada, settling near Toronto. Around 1847, Evans moved to Minnesota, and, soon after, to Wisconsin. On July 16, 1861, he enlisted in Company H, 6th Wisconsin Infantry. He was promoted to sergeant and served until being severely wounded at the Battle of Gettysburg. After his recovery, Evans was transferred to the Veteran Reserve Corps and assigend to guard duty in Washington D. C. Following the expiration of his term of service, Evans returned to Wisconsin, where he married Lucretia Sweet (1849-1924); the couple would have ten children. In 1873, the Evanses moved to Oregon, and soon afterward to Genesee, Idaho. The 1880 federal census lists the family as farmers in Nez Perce County. In 1885, Evans and his family moved a final time, to Washington.The territorial census of 1887 lists the family in Whatcom County. During the Nez Perce War, Evans served as a first lieutenant of militia. William Evans died in Blaine (Whatcom County), Washington, on November 8, 1907, and was buried in Greenacres Memorial Park, Ferndale. While this William Evans' service in Company B, 6th Wisconsin can be confirmed through documentary evidence, his connection to family members mentioned in the letters within this collection could not be established.