Countersign. In military discipline or manœuvres, is a watch-word given by the commanding officer of an army or garrison daily, in order that a friend may be distinguished from an enemy. The countersign is given to sentinels, and others who are immediately concerned. It is given in garrison to prevent unauthorized persons from passing the guards. The countersign is usually the name of a battle.

Counter-swallowtail. In fortification, is a kind of an outwork very much resembling a single tenaille.

Counter-trenches. Are trenches made against the besiegers, which consequently have their parapets turned against the enemy’s approaches, and are enfiladed from several parts of the place on purpose to render them useless to the enemy, if they should chance to become masters of them; but they should not be enfiladed or commanded by any height in the enemy’s possession.

Counter-vair. A heraldic fur. It differs from [vair] by having its cups or bells of the same tinctures placed base against base, and point against point. The tinctures are [or] and [azure].

Coup de Grace. A finishing or decisive stroke.

Coup de Main. A sudden and vigorous attack, for the purpose of instantaneously capturing a position.

Coup d’Œil. The gift of rapidly grasping and turning to the best account the contingencies of war, and the features of the country which is its scene.

Couped (Fr. coupé). A term in heraldry, used to describe the head or any limb of an animal cut off from the trunk, and smooth. When crosses, bends, bars, etc., are cut so as not to touch the sides of the escutcheon, they are also said to be couped.

Coupe-gorge (Fr.). Literally means cut-throat. It is used in a military sense to signify any spot or position which affords an enemy so many advantages that the troops who occupy it must either surrender or be cut to pieces.

Coupures. In fortification, are passages cut through the glacis, of about 12 or 15 feet broad, in the re-entering angle of the covert way, to facilitate the sallies of the besieged. They are sometimes made through the lower curtain, to let boats into a little haven built in the re-entrant angle of the counterscarp of the outworks.