All Quiet on the Western Front
How do these soldiers show that they have great skill in the art survival?
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They show they have great skill in the art of survival by emotionally detaching themselves from the death and killing going on around them. If they thought of it in any other way, they'd become a detriment to both themselves and their comrades. To think would be death~ being numb to everything around them allowed them to survive.
All Quiet on the Western Front