War and Peace vocabulary

When Madame Bovary looked up, she always saw him there, like a sentinel on duty

Gustave Flaubert. Madame Bovary

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These two girls had been above an hour in the place, happily employed in visiting an opposite milliner, watching the sentinel on guard, and dressing a salad and cucumber.

Jane Austen. Pride and Prejudice (1813)

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But dwarfing it all was a massive range of mountains that hovered above and behind, like sentinels standing guard.

William P. Young. The Shack (2007)