Judges 8:17

And he beat down the tower of Penuel
As he threatened he would, ( Judges 8:9 ) whether this was before or after he had chastised the elders of Succoth, is not clear; one would think by the course he steered going from Succoth to Penuel, as he went, he should come to Penuel first at his return; however, he demolished their tower in which they trusted:

and slew the men of the city;
perhaps they might, as Kimchi conjectures, resist when he went about to beat down their tower; on which a fray might ensue, in which they were slain; or they might upon his approach, sensible of the offence they had given him, fly to their tower for safety, and were killed in it when that was beaten down about them. In what manner this was done is not said; no doubt they had instruments in those days for demolishing such edifices.