Formidable class of pre-dreadnought battleships

The Formidable class of pre-dreadnought battleships were enlarged versions of the previous Majestic and Canopus class ships, this time using the advantages of Krupp steel and water-tube boilers to improve the protection of the ships rather than their speed.
HMS Formidable was the name ship of the Formidable class of pre-dreadnought battleships. On 1 January 1915 she was sunk by U 24 while on a practice exercise in the English Channel.
HMS Implacable was the only Formidable class battleship to survive the First World War.
HMS Irresistible was a Formidable class pre-dreadnought battleship sunk during the Allied attempt to force the Dardanelles on 18 March 1915.