I had found Tristram Warren buried in French Cemetery near where my daughter used to live in Parkman. My family is from Buckfield and I was able to confirm my suspicion that he was from the Warrens of Buckfield.
I have 22 family "trees" on ancestry.com and on my "Findagrave Research" family tree I often link to other trees looking for clues and trying to "give back" by following up on those leads and either confirming or "debunking" them.
I am afraid that all I know for now about Horatio is what I found on those 6 other family trees on ancestry.com that have Horatio Warren. Is one of them yours?