An Outlier Among Prophets

In the Book of Judith, Holofernes asks his local allies about the Hebrews.
Achior, an Ammonite, outlines the history and then ends with:

5:(20-21)"So now, my lord and master, if these people are at fault, and are sinning against their God, and if we verify this offense of theirs, then we shall be able to go up and conquer them. But if they are not a guilty nation, then your lordship should keep his distance; otherwise their Lord and God will shield them, and we shall become the laughing stock of the whole world."

To which Holofernes responds:

6:2 "Who are you, Achior, to prophesy among us as you have done today, and to tell us not to fight against the Israelites because their God protects them? What god is there beside Nebuchadnezzar? He will send his force and destroy them from the face of the earth. Their God will not save them.

Military advice based on historical knowledge from an Ammonite is prophetic?
Apparently so. In other contexts, advice based on historical knowledge causes eyes to glaze over, yawns, etc...