=Army Regulations.= This is the name of a work published by the War Department embodying all the acts of Congress, and the rules laid down by the President for the management of the army, both in peace and war. See REGULATIONS. =Arnaouts=, or =Arnouts, Corps des=. Militia of Greece organized during the war of Russia against the Porte in 1769. =Arnheim.= A fortified city in Holland; it was captured by the French in 1672; taken by storm by the Prussians under Gen. Von Bulow in 1815. =Arnott’s Pump.= An ingeniously arranged machine for forcing pure air into buildings. =Arquebusade.= Shot of an arquebuse. Also distilled water from a variety of aromatic plants, as rosemary, millefoil, etc., applied to a bruise or wound; so called because it was originally used as a vulnerary in gunshot wounds. =Arquebuse=, or =Harquebuse=. An old fire-arm resembling a musket, which was supported on a rest by a hook of iron fastened to the barrel. It was longer than a musket, and of large calibre, and formerly used to fire through the loop-holes of antique fortifications. =Arquebusier.= A soldier armed with an arquebuse. =Arques= (Northern France). Near here the league army, commanded by the Duc de Mayenne, was defeated by Henry IV., September 21, 1589. =Arracan.= A province of Northeast India. Arracan, the capital, taken by the Burmese, 1783; was taken from them by Gen. Morrison, April 1, 1825. The subjugation of the whole province soon followed. =Arrah.= A town in British India, in the presidency of Bengal, the scene of several exciting incidents in the Indian mutiny. The English troops gained a victory here over the mutinous Sepoys in 1857. =Arras= (Northeast France). The ancient Atrebates; conquered by Cæsar in 50 B.C.; captured and sacked by the Vandals in 407; captured by the Normans in 880; besieged by Charles VI. in 1414; captured by Louis XI.; held by the Austrians from 1493 till 1640, when it was taken by Louis XIII.; besieged by the Spaniards in 1654. =Arrawak Indians.= A race or collection of tribes of Indians in Guiana, who were formerly numerous and powerful. =Array.= Order; disposition in regular lines; hence, a posture for fighting; as, drawn up in battle array. =Arrayer.= In some early English statutes, an officer who had care of the soldiers’ armor, and who saw them duly accoutred. =Arrest.= The temporary confinement of officers in barracks, quarters, or tents, pending trial by court-martial, or the consideration of their imputed offenses previous to deciding whether they shall or shall not be tried. (See APPENDIX, ARTICLES OF WAR, 65.) Private soldiers are usually placed under guard; by the custom of the service non-commissioned officers may be simply placed in arrest in quarters.