John Oliver was my great grand-father your great-grandfather John Dunn is buried in the Dexter, ny Cemetery. Ellen Bray is buried in Oswego ,Ny I believe in the "River Cemetery". I have copies of John Oliver and Ellen Bray's Death certificate her family was from County Cork Ireland. I think from what I was told John Dunn and John Oliver were friends and fought in the US civil war together. John Oliver was from the Deseronto area in Ontario. The story I was told was that John Dunn Sr. was buried in one of the little town cemetery's that are now sitting on Fort Drum,Ny. I have never looked for him but these are the stories I was told.
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