The Collaborative International Dictionary of English v.0.48:

maraud \ma*raud"\, v. i. [imp. & p. p. Marauded; p. pr. & vb.
   n. Marauding.] [F. marauder, fr. maraud vagabond, OF.
   marault; of uncertain origin, perh. for malault, fr.
   (assumed) LL. malaldus; fr. L. malus bad, ill + a suffix of
   German origin (cf. Herald). Cf. Malice.]
   To rove in quest of plunder; to make an excursion for booty;
   to plunder. "Marauding hosts." --Milman.
   [1913 Webster]

WordNet (r) 3.0 (2006):

marauding
    adj 1: characterized by plundering or pillaging or marauding;
           "bands of marauding Indians"; "predatory warfare"; "a
           raiding party" [syn: marauding, predatory, raiding]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "marauding":
   banditry, brigandage, brigandism, depredation, despoiling,
   despoilment, despoliation, direption, foraging, foray, freebooting,
   looting, pillage, pillaging, plunder, plundering, plunderous,
   predacious, predatory, raid, raiding, ransacking, rape, rapine,
   ravage, ravagement, ravaging, ravishment, razzia, reiving, rifling,
   sack, sacking, spoiling, spoliation, spoliatory