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artillery [artillery 词源字典]: artillery: [14] Originally artillery meant ‘military supplies, munitions’ (Chaucer used it thus); it was not until the late 15th century that it came to be used for ‘weapons for firing missiles’ – originally catapults, bows, etc. The source of the English word was Old French artillerie, a derivative of the verb artiller ‘equip, arm’. This was an alteration of an earlier form atillier, probably influenced by art, but the ultimate provenance of atillier is not clear.

Some etymologists trace it back to a hypothetical Latin verb *apticulāre ‘make fit, adapt’, a derivative of aptus ‘fitting’ (source of English apt and adapt); others regard it as a variant of Old French atirier ‘arrange, equip’ (source of English attire [13]), which was based on tire ‘order, rank’, a noun of Germanic origin, related to Latin deus ‘god’.
[artillery etymology, artillery origin, 英语词源]
artillery (n.): late 14c., "warlike munitions," from Anglo-French artillerie, Old French artillerie (14c.), from artillier "to provide with engines of war" (13c.), which probably is from Medieval Latin articulum "art, skill," diminutive of Latin ars (genitive artis) "art." But some would connect it with Latin articulum "joint," and still others with Old French atillier "to equip," altered by influence of arte. Sense of "engines for discharging missiles" (catapults, slings, bows, etc.) is from late 15c.; that of "ordnance, large guns" is from 1530s.
battlement (n.): early 14c., from Old French bataillement, earlier bastillement "fortification," from bastillier "to fortify, to equip with battlements," from bastille "fortress, tower" (see bastion). The raised parts are cops or merlons; the indentations are embrasures or crenelles.