Question: To which event where three Roman legions were distroyed is the phrase The German Forest sometimes used to refer to?
Sentence (from "Battle of the Teutoburg Forest"): The anti-Roman alliance was led by Arminius, a Germanic officer of Varus' auxilia who had acquired Roman citizenship and had received a Roman military education, thus enabling him to deceive the Roman commander methodically and anticipate the Roman army's tactical responses.
Relevant evidence: No