marauder

One who marauds; a rover in quest of booty or plunder; a plunderer; especially, one of a number of soldiers or of an organized band engaged in spoliation.

Synonyms Freebooter, etc. See robber.

A rover in quest of booty or plunder; a plunderer; one who pillages.

Someone who moves about in roving fashion looking for plunder. (e.g. a band of marauders).

A band of outlaws who raid and pillage.