Cheveau-de-Frise.—A cylinder, of iron when practicable, with sharp, projecting spears on all sides; to oppose an invading force, or to close a gap in the defences.

Command.—A body of troops, or a separate command.

Corduroy.—(“Cord of the King.”) An extemporized road, a uniting cord, by a series of parallel logs across a swamp or soft ground.

Countersign.—A confidential word of recognition, changed daily or more frequently, emanating from the officer in chief command.

Curtain.—A wall connecting two bastions.

Detachment.—A fraction of a command, or troops assigned to some special duty.

Detail.—An assignment for special duty.

Engineering.—See Preface.

Fascines.—Bundles or faggots of brushwood, or small poles, tied together, for defence or for crossing swamps.

Fusee.—A small musket of early times.