
The counterguard (Kontergarde, contre-garde) is an outwork in a bastioned fortification system that usually comprises only a low rampart and which is sited in front of the actual fortress moat that runs around the bastions or ravelins. The rampart way of a counterguard is, however, so constructed and at least wide enough that it enables the positi...
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http://en.wikipedia.org/wiki/Counterguard

• (n.) A low outwork before a bastion or ravelin, consisting of two lines of rampart parallel to the faces of the bastion, and protecting them from a breaching fire.
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http://thinkexist.com/dictionary/meaning/counterguard/

A long, near-triangular freestanding fortification within the moat.
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http://www.castlesontheweb.com/glossary.html

A long, near-triangular freestanding fortification within the moat.
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http://www.encyclo.co.uk/local/20018

Earthwork to protect the base of a curtain wall.
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http://www.encyclo.co.uk/local/20769

Detached structure protecting a bastion.
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http://www.encyclo.co.uk/visitor-contributions.php
Coun'ter·guard` (koun'tẽr*gärd`)
noun (Fort.) A low outwork before a bastion or ravelin, consisting of two lines of rampart parallel to the faces of the bastion, and protecting them from a breaching fire.
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http://www.encyclo.co.uk/webster/C/172

In fortifications, a counterguard is a low outwork before a bastion or ravelin, consisting of two lines of rampart parallel to the faces of the bastion, and protecting them from a breaching fire.
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http://www.probertencyclopaedia.com/browse/FC.HTM
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