Willard Sweet was born in 1836 in Oneida County, New York.
Willard may have been living with the Cran family on a farm in Vernon, Oneida County, New York in 1850. In any case, he left New York and had settled in western Michigan by the time the war had broken out.
He stood 5’6” with gray eyes, brown hair and alight complexion and was a 25-year-old farmer possibly living in Allegan County when he enlisted in Company I on May 13, 1861. He was reported working as a nurse in the Regimental hospital from February of 1863 through May of 1864, and he reenlisted on December 24, 1863, at Brandy Station, Virginia, crediting Algoma, Kent County. He was presumably absent on veteran’s furlough in January of 1864, probably rejoined the Regiment on or about the first of February and was transferred to Company I, Fifth Michigan infantry upon consolidation of the Third and Fifth Michigan Regiments on June 10, 1864. In July he was reported as a Regimental hospital attendant, was on detached service in October, and a nurse in the hospital at City Point, Virginia from November of 1864 through March of 1865. He was mustered out on July 5, 1865, at Jeffersonville, Indiana.
It is not known if Willard ever returned to Michigan.
He was married.
In 1887 he applied for and received a pension (no. 382208).
Willard was apparently residing in Cheney, Kansas, where he died at the age of 57 of dropsy on July 20, 1893.
His widow applied for and received a pension (no. 408561).