Sertorius (19.2-19.3)

Now, the battle on the Sucro[*] is said to have been precipitated by Pompey, in order that Metellus might not share in the victory. Sertorius, too, wished to fight the issue out with Pompey before Metellus came up, and therefore drew out his forces when evening was already at hand, and began the engagement, thinking that, since his enemies were strangers and unacquainted with the region, darkness would be a hindrance to them either in flight or in pursuit.

When the fighting was at close quarters, it happened that Sertorius was not himself engaged with Pompey at first, but with Afranius, who commanded Pompey’s left, while Sertorius himself was stationed on the right. Hearing, however, that those of his men who were engaged with Pompey were yielding before his onset and being worsted, he put his right wing in command of other generals, and hastened himself to the help of the wing that was suffering defeat.