apostrophe
From LSJ
δι' ἐρημίας πολεμίων πορευόμενος → he marched on without finding any enemy, his route lay through a country bare of enemies
Latin > English (Lewis & Short)
ăpostrŏphē: ēs, f., = ἀποστροφή> (a turning away),
I a rhetorical figure, when the speaker turns from the judges or his hearers, and addresses some other person or thing, an apostrophe, Quint. 9, 2, 38; 9, 3, 24; Mart. Cap. 5, p. 171 (e. g. Cic. Lig. 3 sq.; id. Verr. 2, 1, 9 al.).