• Webster's Revised Unabridged Dictionary
    • n Counterguard koun"tẽr*gärd` (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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Century Dictionary and Cyclopedia
    • n counterguard In fortification, a small rampart or work, properly a work raised before the point of a bastion, consisting of two long faces parallel to the faces of the bastion, and making a salient angle.
    • n counterguard A certain part of a sword-hilt. In general, any part of the hilt, other than the cross-guard, which serves to protect the hand. In this sense the basket-hilt and knuckle-bow are counter-guards. See cut under hilt.
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In literature:

In fortification, formerly, a counterguard.
"The Sailor's Word-Book" by William Henry Smyth
UNLIKE the marches of the land, with guard and counterguard, we had no frontiers on the sea.
"Merchantmen-at-Arms" by David W. Bone
There are also counterguards in front of the salients, whose ends overlap the ends of the tenaille.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6" by Various