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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.

ravelin, demilune

In fortifications, a projecting outwork forming a salient angle.
References in periodicals archive ?
Contract notice: 17/034 Multi-Disciplinary Design Consultancy Services for New Indoor Sports Facilities at Ravelin Park.
On the approaches to St Petersburg, it straddles a cluster of islands with an intricately woven network of daunting rubble bastions, curtain walls and ravelins punctuated by austere ashlar NeoClassical openings.