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crown-work

ˈcrown-work Fortif.
  Formerly crowned work.
  See quots.

1677 Lond. Gaz. No. 1179/2 The Town..having a large Hornwork with a Halfmoon on each side of it, and a crowned Work before it, all fac'd with Stone and Brick. Ibid. No. 1181/4 Retiring into an Half-moon faced with Brick, which was in the middle of the said Crowned work. 1678 tr. Gaya's Art of War ii. 115 Couronnement, or a Crown-work, is a Work made beyond the Horns to gain Ground, and force off the Enemies. 1859 F. A. Griffiths Artil. Man. (ed. 9) 262 A Crown-work is composed of a bastion between two curtains..terminated by half bastions. It is joined to the body of the place by two long sides.

Oxford English Dictionary

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