SMS Friedrich der Grosse  was an ironclad turret ship built for the German Kaiserliche Marine. She was the second of three Preussen-class ironclads, in addition to her two sister-ships Preussen and Grosser Kurfürst. Named for Frederick the Great, she was laid down at the Imperial Dockyard in Kiel in 1871 and completed in 1877. Her main battery of four 26 cm (10 in) guns was mounted in a pair of twin gun turrets amidships.

SMS König Wilhelm  was an armored frigate of the Prussian and later the German Imperial Navy. The ship was laid down in 1865 at the Thames Ironworks shipyard in London, originally under the name Fatih for the Ottoman Empire. She was purchased by Prussia in February 1867, launched in April 1868, and commissioned into the Prussian Navy in February 1869. The ship was the fifth ironclad ordered by the Prussian Navy, after Arminius, Prinz Adalbert, Friedrich Carl, and Kronprinz. She was built as an armored frigate, armed with a main battery of sixteen 24 cm (9.4 in) and five 21 cm (8.3 in) guns; several smaller guns and torpedo tubes were added later in her career.