Final answer:
In the story 'The Sniper', the protagonist finds out the enemy he killed is his own brother. This conveys the narrator's message about the tragedy and senselessness of war, particularly civil wars where familial relationships can be destroyed unknowingly.
Step-by-step explanation:
In the short story 'The Sniper' by Liam O'Flaherty, the sniper discovers at the end of the story that the enemy he killed was his own brother. This shocking and heartbreaking discovery is the narrative's twist ending. The message the narrator conveys through this discovery is the tragedy and futility of civil wars, where brother can end up killing brother without even knowing it.
The narrator uses this unfortunate revelation to emphasize the senselessness and devastating consequences of war, in this case, the Irish Civil War. War not only causes physical damage but also tears families apart, which is accurately symbolized through the ending of the story.
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