Warrior was ordered as part of the 1903–04 naval construction programme as the first of four armoured cruisers and
laid down on 5 November 1903 at
Pembroke Dockyard. Her eponym, the once-innovative
armoured frigate (at the time converted to a depot ship) , was renamed to HMS
Vernon III in 1904 to free up the name. She was launched on 25 November 1905 and completed on 12 December 1906. On completion,
Warrior was assigned to the
5th Cruiser Squadron in the
Channel Fleet until 1909, when she was transferred to the
2nd Cruiser Squadron. On 15 September 1909 one of
Warriors boiler tubes failed during firing practice, and she was repaired at
Devonport Dockyard. In 1913 the ship was transferred to the
1st Cruiser Squadron of the
Mediterranean Fleet. She was involved in the pursuit of the German battlecruiser
Goeben and light cruiser
Breslau at the outbreak of World War I, but was ordered not to engage them. A few days later she was ordered to
Suez to defend the
Suez Canal against any Turkish attack and remained there until 6 November when she was ordered to
Gibraltar to join a squadron of French and British ship to search for German warships still at sea off the African coast. This was cancelled on 19 November after the location of the German
East Asia Squadron was revealed by survivors of the
Battle of Coronel.
Warrior joined the Grand Fleet in December 1914 and was assigned to the
1st Cruiser Squadron under
Rear-Admiral Sir
Robert Keith Arbuthnot. At the
Battle of Jutland on 31 May 1916, the 1st Cruiser Squadron was in front of the Grand Fleet, on the right side. At 5:47 p.m., the squadron flagship, , and
Warrior spotted the German
II Scouting Group and opened fire. Their shells felt short and the two ships turned to port in pursuit, cutting in front of the battlecruiser , which was forced to turn away to avoid a collision. Shortly afterwards they spotted the disabled German light cruiser and closed to engage. When the two ships reached a range of from
Wiesbaden they were spotted in turn at 6:05 by the German battlecruiser and four battleships who were less than away. The fire from the German ships was heavy and
Defence blew up at 6:20.
Warrior was hit by at least fifteen and six shells, but was saved when the German ships switched their fire to the battleship when its steering jammed and caused
Warspite to make two complete circles within sight of much of the
High Seas Fleet. to allow her to withdraw to the west. She was taken in tow by the
seaplane tender who took off her surviving crew of 743. She was abandoned in a rising sea at 8:25 a.m. on 1 June when her upper deck was only 4 feet (1.2 m) above the water, and subsequently
foundered. ==Wreck Discovery==