Thomas Guinn | |
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| Born | March 5, 1836 Clinton County, Ohio |
| Died | September 12, 1908 (aged 72) Ohio |
| Place of burial | Springlawn Cemetery, New Paris, Ohio |
| Allegiance | United States |
| Service | United States Army Union Army |
| Rank | Private |
| Unit |  Company D, 47th Ohio Volunteer Infantry Regiment |
| Battles / wars | American Civil War • Siege of Vicksburg |
| Awards | Medal of Honor |
Thomas Guinn (1836 – 1908) was a Union Army soldier during the American Civil War. He received the Medal of Honor for gallantry during the Siege of Vicksburg on May 22, 1863.