Train derailment...steamship boiler explosions (which killed a lot of teamsters on shore)...this could be anything or any disaster.

Check out newspapers too. Here are some links for holdings.

http://nutrias.org/info/louinfo/chronolist.htm#1861

http://www.americanantiquarian.org/Microfilm/tx.htm

Are you 100% sure his in an unmarked grave? Lots of bodies were sent home too.

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David Upton