Judges 6:2
And the hand of Midian prevailed against Israel: and because of the Midianites the children of Israel made them the dens which are in the mountains, and caves, and strong holds.
Torrey's Topical Textbook—AKJV

2 Chronicles 11:11
And he fortified the strong holds, and put captains in them, and store of victual, and of oil and wine.
Torrey's Topical Textbook—AKJV