Aaron S. Daggett
Aaron Simon Daggett was the last surviving Union general of the American Civil War when he died at the age of 100. During the war, Daggett fought at West Point, Gaines Mill, Goldings Farm, White Oak Swamp, Second Bull Run, South Mountain, Antietam, Rappahannock Station, and Fredericksburg.
Daggett was born in Greene, Maine, in 1837 to Yankee parents, whose Puritan ancestors came to New England as part of the Puritan migration from England in 1630. Both of Daggetts grandfathers served in the Revolutionary War.
Source: Wikipedia