battleyoudaoicibaDictYouDict[battle 词源字典]
battle: [13] English acquired battle via Old French bataille and Vulgar Latin *battālia from late Latin battuālia ‘fencing exercises’. This was a derivative of the verb battuere ‘beat’ (source also of English batter and battery), which some have viewed as of Celtic origin, citing Gaulish andabata ‘gladiator’, a possible relative of English bat.

Related words include battalion [16], ultimately from Italian battaglione, a derivative of battaglia ‘battle’; battlements [14], from Old French batailler ‘provide with batailles – fortifications or battlements’; and derivatives such as abate, combat, and debate.
=> abate, bat, battalion, battery, combat, debate[battle etymology, battle origin, 英语词源]
battalion (n.)youdaoicibaDictYouDict
1580s, from Middle French bataillon (16c.), from Italian battaglione "battle squadron," from diminutive of Vulgar Latin battalia "battle," from Latin bauttere "to beat" (see batter (v.)). Specific sense of "part of a regiment" is from 1708.
Madame, lui répondit-il, ne vous y fiez pas: j'ay tôujours vû Dieu do coté des gros Batallions. [E.Boursault, 1702]