Farrow's military encyclopedia : a dictionary of military knowledge . diflerent sizes. Itis mentioned bv Vesetins. See Ballsta. ONE-HORSE litter.—A litter intended to bedragged by one horse or mule. It is variously ex-temporized from such material as may be at drawing, from a photograph of one of these to wals not more than 2i feet thick, the others toheavier walls; the object being to lessen, as far aspracticable, the weakness which loop-holes neces-sarily cause to the wall; this defect increasing asthe exterior or interior opening is greater. For thin walls, where the plan of the lo
Farrow's military encyclopedia : a dictionary of military knowledge . diflerent sizes. Itis mentioned bv Vesetins. See Ballsta. ONE-HORSE litter.—A litter intended to bedragged by one horse or mule. It is variously ex-temporized from such material as may be at drawing, from a photograph of one of these to wals not more than 2i feet thick, the others toheavier walls; the object being to lessen, as far aspracticable, the weakness which loop-holes neces-sarily cause to the wall; this defect increasing asthe exterior or interior opening is greater. For thin walls, where the plan of the loop-hole istrapezoidal, the width of the exterior opening maybe from 3 to 4 inches, and that of the interior from15 to 18 inches. These dimensions, however, mayvary according to the field of fire to be brouglitwithin tlie range of the loop-hole, the more or lesscover to be given to the troops, and the strength ofthe masonry of which the wall is formed. The ver-tical dimensions of the loop-hole, both on the inter-ior and the exterior, will depend upon the field of. contrivances, used in the Powder River Indian Cam-paign, in 1876, shows the manner of its constructionand use. When two animals can be spared, or whenthe country to be passed over is exceedingly rough,the tiroJiorse litter will usually give better satisfac-tion. See Litter, Stretcher and Iravee. ONEIN.—An offensive weapon of mediaeval times,consisting of a staff with a hooked iron head. OPEN.—A term frequently used in military move-ments and dispositions, in contradistinction to close;as open column, open distance, open order, etc. Italso constitutes part of a word of command; as,rear open order. By open distance in aihimn is meantthat the intervals are always equal in depth to theextent in front of the different component parts ofthe column. OPEN DEFENSES.—To this class belong the ar-rangement of the parapet which has already beendescribed ; simple loiyp-holed loalls for musketry usedas inclosurcs of gorges, e
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