http://www.battleships.spb.ru/0779/E-9-uspeh.html
http://www.warships.ru/kr/MK18/Mk18-1.htm

Наконец в ноябре 1915 года Хортон уничтожил “Ундину” — последний из бронепалубных крейсеров II ранга, на смену которым пришли германские легкие крейсеры дредноутской эпохи, доставившие столько хлопот и неприятностей британскому флоту...

http://en.wikipedia.org/wiki/SMS_Undine

SMS Undine was an Imperial German light cruiser of the Gazelle Class, 105 meters long and was built in Kiel in 1902. Undine was used in the Naval warfare of World War I and was part of the German High Seas Fleet.

Undine's job was to protect transport of iron ore between Sweden and Germany. Both Russians and the English were annoyed by the exchange between the two countries. The British sent a submarine flotilla to the Baltic sea to stop the trade.

On 7 November, 1915, Undine was on patrol in the Baltic Sea with two other destroyers when she was brought up by the English submarine HMS E19 which was able to sink her using two torpedoes. It now lies on the bottom of the Baltic sea 20 Nautical miles (40 km) south of Scania, Sweden.

HMS E19 was an E-class submarine of the Royal Navy, commissioned in 1914 at Vickers, Barrow-in-Furness. [1] During World War I she was part of the British submarine flotilla in the Baltic.

Under the command of Lieutenant Commander Francis Cromie