Ellis was captured on October 18, 1863 and died April 1, 1864. According to the widow's pension app, he was held at Belle Isle, Virginia. Near the bottom it says the widow "says that her husband died at Annapolis Maryland in the General Hospital, in Ohio (sic)on the 2nd day of April, AD 1864 of starvation, or the effects of starvation, as a prisoner of war while on Belle Island, in Va (Virginia). Elsewhere, the widow's application says he died of diarrhea.
One thing puzzles me about this. He probably died of a combination of starvation and dehydration (diarrhea). The date of April 2 suggests that he died late in the day, since deaths after the clerk had turned in for the day were recorded in the death records the next day. The thing I'm wondering about is that prisoner exchanges were halted during the summer of 1863. I can't figure out why he's in Annapolis in April of '64. By then, Andersonville had opened and they'd been moving prisoners from Belle Isle to the bigger prison at Andersonville. The only thing I can think of is that either someone intervened on his behalf, or that possibly he escaped while being moved to Andersonville. But I just don't know.
Below is one of the pages from the Widow's pension application. I lifted it from Fold 3. His Memorandum from Prisoner of War Records would be one of the last pages in his Compiled Military Service Record. The index card for this record in on Fold3, but his actual CMSR isn't posted yet. If you are really curious, you can send to the National Archives for it (they cost $30), but the Archives haven't reopened for researchers yet, and with covid, they are probably YEARS behind fulfilling the orders (i got a file I sent for in November, 2019, just last week). It would be cheaper and probably faster to hire a researcher to get it for you when the archives reopen. I'm using Bob Velke, and I think there are other researchers on the board as well. But there may not be much more in the Memorandum than you already know.
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