SMS Mackensen 1917
The Mackensen class was the last class of battlecruisers to be built by Germany in World War I. The design initially called for seven ships, but three of them were redesigned as the Ersatz Yorck class. Of the four ships of the Mackensen class, Mackensen, Graf Spee, and Prinz Eitel Friedrich were launched, and Fürst Bismarck was not—but none were completed, after wartime shipbuilding priorities were redirected towards U-boat—and the ships were broken up in the early 1920s. The lead ship of the class was named for August von Mackensen, a prominent military commander during the war.
The design of the Mackensens was a much improved version of the previous Derfflinger class. The most significant improvement was a new, more powerful 35 cm (14 in) gun, compared to the 30.5 cm (12 in) gun of the earlier ships. The Mackensen-class ships also featured more powerful engines that gave the ships a higher top speed and a significantly greater cruising range.
Mackensen was laid down on 30 January 1915 at Blohm & Voss in Hamburg and was launched on 21 April 1917. Construction was halted about 15 months before she would have been completed.