Great question — answering as the UphillTech team:
The character at the starting of the movie, the one who is comforting the dying soldier at the field hospital and the one appearing at a later time as Ruby's father is the same one. Both are Brendan Gleeson playing Stobrod Thewes. From the Wiki : Three years later, Inman fights in the Battle of the Crater and survives; he then comforts a dying acquaintance from Cold Mountain, while fellow soldier Stobrod Thewes plays a tune on his fiddle . Also this explains: By the time the story starts, he's gone off to fight in the war, and Ruby thinks he may be dead. Stobrod turns up partway through the story, having deserted the army......Eventually, the Home Guard finds Stobrod and Pangle and brutally...
Full answer by Spectra: https://movies.stackexchange.com/a/93654 (CC BY-SA 4.0).
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