An Impartial God

Homer, Iliad 18.309 (Hector speaking; tr. A.T. Murray):

Alike to all is the god of war, and lo, he slayeth him that would slay.

ξυνὸς Ἐνυάλιος, καί τε κτανέοντα κατέκτα.

Cicero, Letters to Friends 6.4.1 (tr. D.R. Shackleton Bailey):

In every war the God of Battles fights in both ranks, and the outcome of a battle is always in doubt.

nam cum omnis belli Mars communis et cum semper incerti exitus proeliorum sunt...