James Buchanan Eads was contracted to build a group of these objects named for Samuel Pook in the St. Louis neighborhood of Carondelet. George Hollins successfully used one of these objects to win the Battle of the Head of Passes. (-5[1])Casemates stored guns in these objects, whose construction was advocated by Stephen Mallory. During the Civil War, major components of these objects were primarily produced in the Confederacy at the Tredegar Works. (-5[1])A steam-powered one (-5[1])of these objects was created by cutting down the captured Merrimack. The first combat between two of these ships (10[1])occurred at the Battle of Hampton Roads. For 10 points, (0[1])the Monitor and the Virginia were what kind of warships protected by a certain metal? ■END■ (10[1])