Chevaux

- de frize, in fortification, a large joist or piece of timber, about 5 or 6 inches square, and 10 or 12 feet in length; into the sides whereof are driven a great number of wooden pins, about 6 feet long, and 1¹⁄₂ inch diameter, cro ing one another at right angles, and pointed with iron. They are used on numberle occasions, as to stop up breaches, to secure avenues to a camp from the inroads both of horse and foot. They are sometimes mounted on wheels, with artificial fires, to roll down in an a ault, . They were first used at the siege of Groningen, in 1658.