master-at-arms In former times was an officer appointed to command the police-duty of a ship, to teach the crew the exercise of small arms, to confine by order of superiors any prisoners, and to superintend their confinement. Also, to take care that fires and lights were put out at the proper hour, and no spirituous liquors brought on board. He was assisted by ship's corporals, who also attended the gangway with the sentinels. Until 1816, the junior lieutenant was nominally lieutenant-at-arms, and drilled the seamen, assisted by the serjeant of marines.
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