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Ravelin

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ravelin, demilune
In fortifications, a projecting outwork forming a salient angle.
Ravelin 

a separate enclosed triangular fortification work, situated in front of the moat, in the interval between the bastions.

The ravelin was designed to cover a section of the fortress wall (curtain), the fortress gates, and other structures from artillery fire and attacks of the enemy. It was also used for cross fire at the approaches to the perimeter of the fortress, for fire support for neighboring bastions, and for an assembly point for troop sallies. Ravelins were used from the 16th to early 20th centuries.
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For what dread of want or poverty that can reach or harass the student can compare with what the soldier feels, who finds himself beleaguered in some stronghold mounting guard in some ravelin or cavalier, knows that the enemy is pushing a mine towards the post where he is stationed, and cannot under any circumstances retire or fly from the imminent danger that threatens him?
Don Quixote by Cervantes, Miguel View in context
 
 
 
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