RMS Mauretania (1906) launched by the Duchess of Roxburghe. At the time of her launch, she was the largest moving structure ever built, and slightly larger in gross tonnage than "Lusitania". The main visual differences between "Mauretania" and "Lusitania" were that "Mauretania" was five feet longer and had different vents. "Mauretania" also had two extra stages of turbine blades in her forward turbines, making her slightly faster than "Lusitania". "Mauretania" and "Lusitania" were the only ships with direct-drive steam turbines to hold the Blue Riband; in later ships, reduction-geared turbines were mainly used. "Mauretania"s usage of the steam turbine was the largest application
German Type U 66 submarine under the command of "Kapitänleutnant" Ludwig Güntzel. Six days into her first war patrol, "U-68" encountered the British Q-ship (Q-ship number five) off Dingle and was sunk with all hands. "U-68" sank no ships during her brief service career. "U-69" was laid down on 7 February 1914 (yard number 206) by Germaniawerft at Kiel and launched on 24 June 1915. She was commissioned on 4 September 1915 under the command of "Kapitänleutnant" Ernst Wilhelms. During her service career, "U-69" sank 31 ships with a combined gross register tonnage of 102,875, the largest among them, the 13,441-ton armed merchant cruiser .