AGGER is also used for a bank or wall, erected against the sea, or some great river, to confine or keep it within bounds; in which sense, _agger_ amounts to the same with what the ancients called _tumulus_ and _moles_; the Dutch, _dyke_; and we, _dam_, _sea-wall_; the Asiatics call them _bunds_, &c. AGIADES, in the Turkish armies, are a kind of pioneers, or rather field engineers, employed in fortifying the camp, &c. AGUERRI, _Fr._ an officer or soldier experienced in war; a veteran. AIDE-DE-CAMP, an officer appointed to attend a general officer, in the field, in winter-quarters, and in garrison; he receives and carries the orders, as occasion requires. He is taken from the line, and all aids-de-camp have extra pay allowed for their duty. This employment is of greater importance than has been generally believed: it has been, however, too often entrusted to young officers of little experience, and of as little capacity; but in the French service they bestow great attention on this article. Marshal de Puysegur mentions the loss of a battle through the incapacity of an aide-de-camp. On the English establishment, generals, being field marshals, have _four_, lieutenant-generals _two_, and major-generals and brigadier-generals _one_. In the United States the number is established by law; though on service the number must necessarily be equal to the exigency, or the various points to which orders must be sent. See _American Mil. Lib._ Article STAFF. AIDE _du Parc des Vivres_, _Fr._ an officer in France, acting immediately under the commissary of stores and provisions. AID-MAJOR. See ADJUTANT. AIGREMORE, a term used by the artificers in the laboratory, to express the charcoal in a state fitted for the making of powder. AIGUILLE, an instrument used by engineers to pierce a rock for the lodgement of powder, as in a mine; or to mine a rock, so as to excavate and make roads. AILE, _Fr._ a wing or flank of an army or fortification. AIM, the act of bringing the musquet, piece of ordnance, or any other missive weapon, to its proper line of direction with the object intended to be struck. AIM FRONTLET, a piece of wood hollowed out to fit the muzzle of a gun, to make it of an equal height with the breech, formerly made use of by the gunners, to level and direct their pieces. It is not used at present. AIR-GUN, a pneumatic machine for exploding bullets, &c. with great violence.