Describe an instance where paul believes chance saved his life

Paul believes that all soldiers believe in "Chance" in the trenches; he cites a lucky incident in which he barely escaped being killed twice in a row. Paul thinks about a time that he left a dug-out and when he returned it was gone. To him and his comrades, life and death become meaningless on the front. "We lie under the network of arching shells and live in a suspense of uncertainty. If a shot comes, we can duck, that is all; we neither know nor can determine where it will fall."