Final answer:
The excerpt from Ernest Hemingway's In Another Country reflects the theme of psychological alienation caused by war.
Step-by-step explanation:
The excerpt from Ernest Hemingway's In Another Country reflects the theme of psychological alienation caused by war. The protagonist in the story is a soldier who has experienced the horrors of World War I, including the misery of trench warfare. The description of the soldiers' defeat, despair, and living in a constant sense of unreality highlights the psychological toll war takes on individuals, resulting in their alienation from themselves and society.