Warrior

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Middle English: from Old Northern French werreior, variant of Old French guerreior, from guerreier ‘make war’, from guerre ‘war’.

wiktionary

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From Middle English werreour, from Anglo-Norman guerreier, Old French guerroiier(“fighter, combattant”), from Medieval Latin werra, from Frankish *werru(“confusion; quarrel”), from Proto-Indo-European *wers-(“to mix up, confuse, beat, thresh”). Displaced native Old English cempa.

etymonline

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warrior (n.)

c. 1300, from Old North French werreier (Old French guerroieor) "a warrior, soldier, combatant, one who wages war," from werreier "wage war," from werre (see war (n.)).