My gg-grandfather had a man working with him, who was a 1st Lieutenant in an artillery unit in the Civil War. He was in a state unit. I have tried to find him in the 1890 Mass. vets census, but my source doesn't say whether the 1890 veterans census for Mass. exists. The officer was a mustang officer and he has the same surname as my gg-grandfather--CARGILL and I'm trying to identify his relationship to us. thanks, Charles