'Stronghold' in the Bible

and build an altar to the LORD your God on the top of the stronghold here, with stones laid in due order; then take the second bull, and offer it as a burnt offering with the wood of the Ashe'rah which you shall cut down."

When all the people of the Tower of Shechem heard of it, they entered the stronghold of the house of El-be'rith.

So every one of the people cut down his bundle and following Abim'elech put it against the stronghold, and they set the stronghold on fire over them, so that all the people of the Tower of Shechem also died, about a thousand men and women.