By curiosity, I wondered if there were some kind of subject-verb inversion in Latin, to indicate a question, despite of the free order.
If we consider the SOV as the most common way, there's indeed a kind of inversion.

Affirmative (most common)
Caesar inimicum superavit. (Caesar defeated the enemy.)

Turning this sentence into a question (subject-verb inversion to add the "-ne" suffix)
Superavitne Caesar inimicum? (Did Caesar defeat the enemy?)

I think it only works for the yes/no question generated by the -ne suffix.