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army [army 词源字典]: army: [14] Latin armāta ‘armed’, the past participle of the verb armāre, was used in postclassical times as a noun, meaning ‘armed force’. Descendants of armāta in the Romance languages include Spanish armada and French armée, from which English borrowed army. In early usage it could (like Spanish armada) mean a naval force as well as a land force (‘The King commanded that £21,000 should be paid to his army (for so that fleet is called everywhere in English Saxon) which rode at Greenwich’, Marchamont Needham’s translation of Selden’s Mare clausum 1652), but this had virtually died out by the end of the 18th century.
=> arm, armada[army etymology, army origin, 英语词源]
armament (n.): c. 1600, "munitions of war" (especially the great guns on board a man-of-war), also "naval force equipped for war" (1690s), from Latin armamentum "implement," from Latin armare "to arm, furnish with weapons" from arma (see arm (n.2)). Meaning "process of equipping for war" is from 1813.
fleet (n.): Old English fleot "a ship, raft, floating vessel," also, collectively, "means of sea travel; boats generally," from fleotan "to float" (see fleet (v.)). Sense of "naval force, group of ships under one command" is in late Old English. The more usual Old English word was flota "a ship," also "a fleet; a sailor." The fleet for "the navy" is from 1712.

The Old English word also meant "estuary, inlet, flow of water," especially the one into the Thames near Ludgate Hill, which lent its name to Fleet Street (home of newspaper and magazine houses, standing for "the English press" since 1882), Fleet prison (long used for debtors), etc.