וַיָּ֧קָם אֲבִימֶ֛לֶךְ וְכָל־הָעָ֥ם אֲשֶׁר־עִמּ֖וֹ לָ֑יְלָה וַיֶּאֶרְב֣וּ עַל־שְׁכֶ֔ם אַרְבָּעָ֖ה רָאשִֽׁים׃
And Abimelech rose up, and all the people that were with him, by night, and they lay in wait against Shechem in four companies.
Read midrashic interpretation of Judges 9:34: and classical rabbinic exegesis.