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

[243] Now there was one Zebul, a magistrate of the Shechemites, that had entertained Abimelech. He sent messengers, and informed him how much Gaal had irritated the people against him, and excited him to lay ambushes before the city, for that he would persuade Gaal to go out against him, which would leave it in his power to be revenged on him; and when that was once done, he would bring him to be reconciled to the city. So Abimelech laid ambushes, and himself lay with them. Now Gaal abode in the suburbs, taking little care of himself; and Zebul was with him. Now as Gaal saw the armed men coming on, he said to Zebul, That some armed men were coming; but the other replied, They were only shadows of huge stones: and when they were come nearer, Gaal perceived what was the reality, and said, They were not shadows, but men lying in ambush. Then said Zebul, "Didst not thou reproach Abimelech for cowardice? why dost thou not then show how very courageous thou art thyself, and go and fight him?" So Gaal, being in disorder, joined battle with Abimelech, and some of his men fell; whereupon he fled into the city, and took his men with him. But Zebul managed his matters so in the city, that he procured them to expel Gaal out of the city, and this by accusing him of cowardice in this action with the soldiers of Ahimelech. But Abimelech, when he had learned that the Shechemites were again coming out to gather their grapes, placed ambushes before the city, and when they were coming out, the third part of his army took possession of the gates, to hinder the citizens from returning in again, while the rest pursued those that were scattered abroad, and so there was slaughter every where; and when he had overthrown the city to the very foundations, for it was not able to bear a siege, and had sown its ruins with salt, he proceeded on with his army till all the Shechemites were slain. As for those that were scattered about the country, and so escaped the danger, they were gathered together unto a certain strong rock, and settled themselves upon it, and prepared to build a wall about it: and when Abimelech knew their intentions, he prevented them, and came upon them with his forces, and laid faggots of dry wood round the place, he himself bringing some of them, and by his example encouraging the soldiers to do the same. And when the rock was encompassed round about with these faggots, they set them on fire, and threw in whatsoever by nature caught fire the most easily: so a mighty flame was raised, and nobody could fly away from the rock, but every man perished, with their wives and children, in all about fifteen hundred men, and the rest were a great number also. And such was the calamity which fell upon the Shechemites; and men's grief on their account had been greater than it was, had they not brought so much mischief on a person who had so well deserved of them, and had they not themselves esteemed this as a punishment for the same.