Seth Hall was a 22 year old resident of Mansfield on August 29, 1863 when he enlisted as a Private in Co. D of the 22nd Regiment Massachusetts Volunteer Infantry; he received a discharge for disability on November 5, 1863. He is also probably the Seth Hall from Mansfield who enlisted on February 6, 1865 as a Private in Co. G of the 14th Regiment United States Infantry; he deserted on August 11, 1865.
He may be the Seth M. Hall, born about 1842 in Mansfield to Ambrose and Esther (Batten) Hall. Seth M. Hall is living in his father’s household in 1850, 1860 and 1880 but not 1870. There is a Seth Hall living in Mansfield as a ward of the town in the 1900 U.S. census with a birth year of 1832.
If he is that Seth Hall, two of his brothers served in the Civil War from Mansfield, Lorenzo and William Hall.