'Stronghold' in the Bible

and build an altar unto Jehovah thy God upon the top of this stronghold, in the orderly manner, and take the second bullock, and offer a burnt-offering with the wood of the Asherah which thou shalt cut down.

And when all the men of the tower of Shechem heard thereof, they entered into the stronghold of the house of Elberith.

And all the people likewise cut down every man his bough, and followed Abimelech, and put them to the stronghold, and set the stronghold on fire upon them; so that all the men of the tower of Shechem died also, about a thousand men and women.