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]