Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[251] Now Abimelech, when he had aftrighted the Israelites with the miseries he had brought upon the Shechemites, seemed openly to affect greater authority than he now had, and appeared to set no bounds to his violence, unless it were with the destruction of all. Accordingly he marched to Thebes, and took the city on the sudden; and there being a great tower therein, whereunto the whole multitude fled, he made preparation to besiege it. Now as he was rushing with violence near the gates, a woman threw a piece of a millstone upon his head, upon which Abimelech fell down, and desired his armor-bearer to kill him lest his death should be thought to be the work of a woman: - who did what he was bid to do. So he underwent this death as a punishment for the wickedness he had perpetrated against his brethren, and his insolent barbarity to the Shechemites. Now the calamity that happened to those Shechemites was according to the prediction of Jotham, However, the army that was with Abimelech, upon his fall, was scattered abroad, and went to their own homes.