C. F. Keil and Franz Delitzsch on Proverbs 21:31

Pro 21:31 31 The horse is harnessed for the day of battle;      But with Jahve is the victory, i.e., it remains with Him to give the victory or not, for the horse is a vain means of victory, Isa 33:17; the battle is the Lord's, 1Sa 17:47, i.e., it depends on Him how the battle shall issue; and king and people who have taken up arms in defence of their rights have thus to trust nothing in the multitude of their war-horses (סוּס, horses, including their riders), and generally in their preparations for the battle, but in the Lord (cf. Psa 20:8, and, on the contrary, Isa 31:1). The lxx translates התּשׁוּעה by ἡ βοήθεια, as if the Arab. name of victory, naṣr, proceeding from this fundamental meaning, stood in the text; תשׁועה (from ישׁע, Arab. ws', to be wide, to have free space for motion) signifies properly prosperity, as the contrast of distress, oppression, slavery, and victory (cf. e.g., Psa 144:10, and ישׁוּעה, 1Sa 14:45). The post-bibl. Heb. uses נצח (נצּחון) for victory; but the O.T. Heb. has no word more fully covering this idea than תשׁועה (ישׁועה).Note: In the old High German, the word for war is urlag (urlac), fate, because the issue is the divine determination, and nôt (as in “der Nibelunge Not”), as binding, confining, restraint; this nôt is the correlate to תשׁועה, victory; מלחמה corresponds most to the French guerre, which is not of Romanic, but of German origin: the Werre, i.e., the Gewirre [complication, confusion], for נלחם signifies to press against one another, to be engaged in close conflict; cf. the Homeric κλόνος of the turmoil of battle.