Parallel
Judges (Alexandrinus A-text) 20:11
Swete's Septuagint · Berean Standard Bible
καὶ συνήχθη πᾶς ἀνήρ ᾿Ισραήλ εἰς τὴν πόλιν ὡς ἀνὴρ εἷς.
So all the men of Israel gathered as one man, united against the city.