sentences:  Secondary armament included eighteen 15 cm (5.9 inch) SK L/40 guns.Six were mounted in single turrets amidships and the rest were mounted in MPL casemates; all were manually operated and elevated.Most of these guns were mounted at upper-deck level, with only four of the casemates at main deck level, which kept them high enough in the ship to avoid a common problem with battleships of the period where heavy seas could make the guns unworkable.