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Notes: OLDENBURG was the fourth ship of the HELGOLAND class, ordered a year later than her three sisters (in the 1909-10 Program). The class was a marked improvement on the preceding NASSAU -- nearly 20% larger, with corresponding improvements in armor. The main battery guns were increased in size to 12" (30.5cm), and magazines and shell rooms were located directly below the turrets. The three funnels were closely spaced amidships, which outwardly distinguished them from the NASSAU class. Each ship slightly exceeded designed speed on trials, with OLDENBURG being the fastest of the four at 21.3 knots. They were noted as being good sea boats, with a small turning circle. OLDENBURG had her funnels raised in 1914. She was fitted with torpedo nets; these were removed early in 1916. The 3.45" guns proved to a disappointment; not only were they generally mounted in unworkable positions, but their "hitting power" proved to be too light against their intended targets. The aftermost pair were removed in 1913, and the remainder in 1916-17. They were replaced by four 3.45" (88mm) anti-aircraft guns, mounted on the aft superstructure.
OLDENBURG was commissioned into the German Navy as a member of the 1st Battle Division (along with her sister ships). She was present at Jutland on 31 May 1916, and was hit twice by British shells (one 6" and one 4"); eight of her crew were killed and another 14 wounded. In return, she fired 53 rounds from her 12" guns, 88 rounds from her 5.9" guns and 30 rounds from her 3.45" guns; it is unclear if any hits were obtained. Upon return to port, repairs took slightly over a month.
Following World War I, OLDENBURG was awarded to Japan as a war prize; she was then sold to a British firm for scrapping, and was broken up at Dordrecht in 1921.