20 And it came to pass when Joshua and all Israel ceased destroying them utterly with a very great slaughter, that those that escaped took refuge in the strong cities.
Joshua 10:20 Cross References - CAB
Deuteronomy 20:16
16 Of these you shall not take anything alive;
Joshua 8:24
24 And when the children of Israel had ceased slaying all that were in Ai, and in the fields, and in the mountain on the descent, from where they pursued them, even to the end, then Joshua returned to Ai, and attacked it with the edge of the sword.
Joshua 10:10
10 And the Lord struck them with terror before the children of Israel; and the Lord destroyed them with a great slaughter at Gibeon; and they pursued them by the way of the going up to Beth Horon, and they struck them as far as Azekah and to Makkedah.
2 Samuel 20:6
6 And David said to Amasa, Now shall Sheba the son of Bichri do us more harm than Absalom: now then take with you the servants of your lord, and follow after him, lest he find for himself strong cities, so will he blind our eyes.
2 Chronicles 13:17
17 And Abijah and his people struck them with a great slaughter; and there fell slain of Israel five hundred thousand mighty men.
Jeremiah 8:14
14 Why do we sit still? Assemble yourselves, and let us enter into the strong cities, and let us be cast out there: for God has cast us out, and made us drink water of gall, because we have sinned before Him.