Don’t give up if at first you aren’t finding your Civil War ancestor in the census for the years or locations you expect. Here is one roadblock you may encounter:
He may have moved. My great-great grandfather lived in Indiana, Missouri, Arkansas, Kansas, and was back and forth in those states over the years.
When I finally found him in the 1910 census, he was in the household of his daughter. She was widowed with 5 children, married again, then widowed again. It wasn’t that easy to find her, but when I did, BINGO.
TIP: Track down their children or their siblings for the missing census year. Sometimes they are living with them.