My great-grandfather James Louis Day was born in New London, Ohio in 1837. So he would have been 23 in 1860, 28 in 1865, prime age for service in the Civil War. There are many James Day's who served in Ohio units, as well as a James L Day who served in an Ohio Cavalry unit. I believe the latter James L Day was not a relative because my great-grandfather moved to Iowa with his pregnant wife and daughter in 1865. The other James L. Day remained in Ohio and collected a pension. James and Marian were married in 1863. Several of their many children had names for famous figures from the Civil war: Florence Nightingale, Colonel Ellsworth, Frank Winfield, so I suspect he may have served. It is also possible that he served in an Illinois unit because his father, John M Day lived the last years of his life in Fulton, Illinois. Any help or insights would be appreciated.