Et maiores vestros et posteros cogitate. - Tacitus

Pacem sine dubio post haec, verum cruentam.

Their shields are black, their bodies dyed. They choose dark nights for battle, and, by the dread and gloomy aspect of their death-like host, strike terror into the foe, who can never confront their strange and almost infernal appearance.

He upbraided Macro, in no obscure and indirect terms, "with forsaking the setting sun and turning to the rising".