Marshal
Middle English (denoting a high-ranking officer of state): from Old French mareschal ‘farrier, commander’, from late Latin mariscalcus, from Germanic elements meaning ‘horse’ (compare with mare1) and ‘servant’.
wiktionary
From Middle English marchal, mareschal, marchall, from Anglo-Norman marescal, marschal and Old French marescal, mareschal(“farrier; military commander”), from Medieval Latin mariscalcus(“groom, army commander, court dignitary”), either from *Frankishmarhskalk [1], or Old High German marah-scalc(“horse-servant”) [2], from Proto-Germanic *marhaz + *skalkaz (whence Old Saxon maraskalk, marahscalc). Compare English mare + shalk.
etymonline
marshal (n.)
mid-13c., "high officer of the royal court," charged with regulating ceremonies and maintaining order (early 13c. as a surname), from Old French mareschal "commanding officer of an army; officer in charge of a household" (Modern French maréchal), originally "stable officer, horse tender, groom" (Frankish Latin mariscaluis) from Frankish *marhskalk or a similar Germanic word, literally "horse-servant" (compare Old High German marahscalc "groom," Middle Dutch maerschalc).
This is from a Proto-Germanic compound of *markhaz "horse" (see mare (n.1)) + *skalkaz "servant" (source of Old English scealc "servant, retainer, member of a crew," Dutch schalk "rogue, wag," Gothic skalks "servant"). It corresponds to Old English horsþegn.
From early 14c. as "military commander, general in the army." In the U.S., a civil officer appointed by the president (with advice and consent of the Senate) in each judicial district as the executive officer of the Supreme Court and the federal courts in his district. For sense development and the tendency of officers of the stable to become chief officers of royal households, compare constable. Also from Germanic are Italian scalco "steward," Spanish mariscal "marshal."
marshal (v.)
mid-15c., marshalen, "to tend (horses)," also "to arrange, place in order;" "arrange (soldiers) for fighting," from marshal (n.). Figurative use is by 1690s. Related: Marshaled; marshaling.
