Lewis & Short

†† barītus (barrītus or bardītus), ūs, m. [cf. bassio and O. Germ. bar, baren, to raise the voice], the war-cry of the Germans; and in gen., battle-cry: clamor, quem baritum vocant, Veg. Mil. 3, 18: cornuti et bracati baritum civere vel maximum, Amm. 16, 12, 43; 21, 13, 15; 26, 7, 14; 31, 7, 11.
Of the battle-song: carmina, quorum relatu, quem barditum vocant, accendunt animos, Tac. G 3 Halm; v. Comm. in h. l.