The next two ships for the North Atlantic Fleet, the USS Dictator and the USS Colossus. Both are from TD.
The USS Dictator is a powerful seagoing Monitor armed two 15” smoothbores in a Coles turret.
The USS Colossus, also known as the USS Kalamazoo, is another seagoing monitor, but with less armour than the Dictator and two turrets both mounting a pair of 11” guns.
And a scale picture with the Dunderberg.