Euryalus, named after the Greek hero Euryalus, was laid down on 18 July 1899 by Vickers, Sons & Maxim at their Barrow-in-Furness shipyard.
She was launched 20 May 1901 in front of 30,000 spectators, and christened by Mrs. Douglas Vickers, wife of one of the directors of the company.
On 11 June 1901, the south side of the Ramsden dock at Barrow caught fire, and was practically destroyed before the flames could be extinguished.
The recently launched Euryalus was laying alongside this wharf, and the fire set ablaze the teak wood sheathing of the cruiser.
Considerable damage was done to the ship before she was hauled from the pier into the middle of the dock, and her completion was severely delayed.
Towed to Cammell Laird at Birkenhead for repairs, the ship slipped off the blocks supporting her in drydock and was severely damaged.
While on sea trials, she collided with the auxiliary vessel Traveller on 27 June 1903 at Devonport.
Euryalus was finally completed on 5 January 1904, nearly two years after her sister ships.

Upon commissioning she became flagship of the Australia Station before returning home in 1905.
Reduced to reserve upon her arrival, she was sent to the North America and West Indies Station in 1906, where she served as a boys' training ship attached to the 4th Cruiser Squadron for the next three years.
Euryalus was assigned to the reserve Third Fleet when she returned home in 1909.
At the outbreak of the war in August 1914, she was assigned to the 7th Cruiser Squadron, tasked with patrolling the Broad Fourteens of the North Sea in support of a force of destroyers and submarines based at Harwich, which protected the eastern end of the English Channel from German warships attempting to attack the supply route between England and France.
On 10 August, she became the flagship of Rear-Admiral Arthur Christian, commander of the Southern Force, formed to command all of the forces defending the eastern end of the Channel.
During the Battle of Heligoland Bight on 28 August, the ship was in reserve off the Dutch coast, and saw no action.

On 20 September 1914, Euryalus and her sisters Aboukir, Cressy and Hogue were on patrol in the Broad Fourteen.
Euryalus had to return to port that morning to recoal.
Two days later the three remaining cruisers were sunk by the SM U-9 and Christian was subsequently relieved of his command.
As a result of these losses, she, and her sister Bacchante, were transferred to the 12th Cruiser Squadron to escort ships between England and Gibraltar in early October.

Euryalus and Bacchante were transferred to Egypt in late January 1915 to reinforce the defences of the Suez Canal, although the Turkish raid on the Suez Canal had already been repulsed by the time that they arrived in February.
Upon arrival Rear-Admiral Richard Peirse, commander of the East Indies Station, hoisted his flag in Euryalus.
By this time the preliminary bombardments of the Turkish defences of the Dardanelles had already occurred, and the sisters were transferred north in March as the Turks east of the Canal proved to be reasonably quiet.

Euryalus became the flagship of Rear Admiral Rosslyn Wemyss in April, after he was put in charge of the main landings at Gallipoli.
During the landings at Cape Helles on the morning of 25 April, Euryalus transported three companies of the 1st Battalion of the Lancashire Fusiliers and a platoon of the Royal Naval Division, and then provided fire support to the landing after the soldiers were transferred to their boats for the actual landing on Beach 'W'.
She also bombarded Turkish positions during the Second Battle of Krithia on 6 May. A month later, Wemyss hauled down his flag and resumed his original commanding of the Allied base at Mudros.
Euryalus received a brief refit at Malta from 30 December 1915 to 20 January 1916 before proceeding to Egypt to reinforce the defences there.

On 15 January 1916 Wemyss, the new Commander-in-Chief, East Indies, hoisted his flag aboard Euryalus.
From 3 January 1917 through 24 April, she was refitted at Bombay.
On 29 June she bombarded the barracks in the Ye
Euryalus, named after the Greek hero Euryalus, was laid down on 18 July 1899 by Vickers, Sons & Maxim at their Barrow-in-Furness shipyard. She was launched 20 May 1901 in front of 30,000 spectators, and christened by Mrs. Douglas Vickers, wife of one of the directors of the company. On 11 June 1901, the south side of the Ramsden dock at Barrow caught fire, and was practically destroyed before the flames could be extinguished. The recently launched Euryalus was laying alongside this wharf, and the fire set ablaze the teak wood sheathing of the cruiser. Considerable damage was done to the ship before she was hauled from the pier into the middle of the dock, and her completion was severely delayed. Towed to Cammell Laird at Birkenhead for repairs, the ship slipped off the blocks supporting her in drydock and was severely damaged. While on sea trials, she collided with the auxiliary vessel Traveller on 27 June 1903 at Devonport. Euryalus was finally completed on 5 January 1904, nearly two years after her sister ships.
Upon commissioning she became flagship of the Australia Station before returning home in 1905. Reduced to reserve upon her arrival, she was sent to the North America and West Indies Station in 1906, where she served as a boys' training ship attached to the 4th Cruiser Squadron for the next three years. Euryalus was assigned to the reserve Third Fleet when she returned home in 1909. At the outbreak of the war in August 1914, she was assigned to the 7th Cruiser Squadron, tasked with patrolling the Broad Fourteens of the North Sea in support of a force of destroyers and submarines based at Harwich, which protected the eastern end of the English Channel from German warships attempting to attack the supply route between England and France. On 10 August, she became the flagship of Rear-Admiral Arthur Christian, commander of the Southern Force, formed to command all of the forces defending the eastern end of the Channel. During the Battle of Heligoland Bight on 28 August, the ship was in reserve off the Dutch coast, and saw no action.
On 20 September 1914, Euryalus and her sisters Aboukir, Cressy and Hogue were on patrol in the Broad Fourteen. Euryalus had to return to port that morning to recoal. Two days later the three remaining cruisers were sunk by the SM U-9 and Christian was subsequently relieved of his command. As a result of these losses, she, and her sister Bacchante, were transferred to the 12th Cruiser Squadron to escort ships between England and Gibraltar in early October.
Euryalus and Bacchante were transferred to Egypt in late January 1915 to reinforce the defences of the Suez Canal, although the Turkish raid on the Suez Canal had already been repulsed by the time that they arrived in February. Upon arrival Rear-Admiral Richard Peirse, commander of the East Indies Station, hoisted his flag in Euryalus. By this time the preliminary bombardments of the Turkish defences of the Dardanelles had already occurred, and the sisters were transferred north in March as the Turks east of the Canal proved to be reasonably quiet.
Euryalus became the flagship of Rear Admiral Rosslyn Wemyss in April, after he was put in charge of the main landings at Gallipoli. During the landings at Cape Helles on the morning of 25 April, Euryalus transported three companies of the 1st Battalion of the Lancashire Fusiliers and a platoon of the Royal Naval Division, and then provided fire support to the landing after the soldiers were transferred to their boats for the actual landing on Beach 'W'. She also bombarded Turkish positions during the Second Battle of Krithia on 6 May. A month later, Wemyss hauled down his flag and resumed his original commanding of the Allied base at Mudros. Euryalus received a brief refit at Malta from 30 December 1915 to 20 January 1916 before proceeding to Egypt to reinforce the defences there.
On 15 January 1916 Wemyss, the new Commander-in-Chief, East Indies, hoisted his flag aboard Euryalus. From 3 January 1917 through 24 April, she was refitted at Bombay. On 29 June she bombarded the barracks in the Ye
HMS Euryalus (1901)