Incidentally, I've just found the text to Dee Hicks' version, which isn't super different, also on banjohangout.

Lincoln was a Union man, a Union man was he
He was determined to set the darkies free

Honor boys, honor, honor don't you know
War is ragin', you're all a bound to go

I'd rather be a Union man and carry a [wooden]? gun
Than to be a Rebel and always have to run

source: https://www.banjohangout.org/archive/160252