This would seem to be his grave:
http://www.findagrave.com/cgi-bin/f...all&GSst=32&GScntry=4&GSsr=7001&GRid=67838827&
According to records at Ancestry.com, he married Lizzie H. Kelso on May 26, 1866 in Concord, New Hampshire, listing his occupation as "soldier." It looks like he filed for his invalid pension Dec. 9, 1865, six months before his marriage. He was 28 and she was 32. He was born in Whitefield, Maine, but he lived in Townsend (NH?) and she lived in New Boston, NH. It was his first marriage, her second.
Here's what he was also doing that year, from the Oct. 21, 1866 Daily Eastern Argus, Portland, ME:
View attachment 17835
She apparently already had children, because in the 1870 census, they were living in New Boston, NH, with 10-year-old Charles E. Kelso, probably her son by her first husband, and next door is Robert P. Kelso, 58, probably her father. He was listed as a farmer, $4200 real estate, $1250 property, born in Maine.
In 1880, they were still in New Boston. Calvin 48, farmer, got a check mark in a new census category "maimed, crippled, bedridden or otherwise disabled." He was still living with Elizabeth H. 51, keeping house, and Charles E. Kelso, 20, son. thanks for the post. I was just going to ask if any one knew what happen to him.
Here's his obituary from the Dec. 12, 1889 New Hampshire Patriot, and perhaps part of the reason he found a bride so soon.
View attachment 17836