Lewis & Short

bellor, āri, 1, dep. (collat. form of bello), to carry on war, to war, to fight (poet.): et pictis bellantur Amazones armis, Verg. A. 11, 660: et nudis bellantur equis, Sil. 2, 349; cf. Non. p. 472, 9; Prisc. 8, 4, 24, p. 796 P.