The River-class (re-designated in 1913 as the E-class) destroyer was a class of torpedo boat destroyer built for the Royal Navy at the turn of the 20th century, and which saw extensive service in World War I. The class introduced new features to destroyer design, placing a greater emphasis on seakeeping and endurance and less on a high maximum speed in good weather. All the ships were named after British rivers, and as such were the first Royal Navy destroyer class to be named systematically (see the article naming conventions for destroyers of the Royal Navy for more details).