Final answer:
Shell shock, also known as combat stress reaction, was a psychological trauma experienced by soldiers who fought in the trenches during World War I.
Step-by-step explanation:
Shell shock, also known as combat stress reaction, was a psychological trauma experienced by soldiers who fought in the trenches during World War I. It was characterized by symptoms such as anxiety, depression, fatigue, and flashbacks. This condition resulted from the extreme and prolonged stress of the war, including exposure to constant danger, noise, and the horrors of the battlefield. Many soldiers experienced shell shock as a result of their experiences in the war.
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