Amiral Baudin, and Redoutable in the Mediterranean Squadron. During the 1897 fleet gunnery trials, which saw the first use of a new system of centralized fire control in the French fleet, Marceau, Neptune, and Brennus all achieved more than 25 percent hits at ranges of between and . In 1898, Marceau and her sisters were assigned to a new training division that was attached to the Mediterranean fleet. The unit continued into 1899, but later that year, Marceau was transferred to the torpedo school. The unit was commanded by Rear Admiral Gabriel Godin. Marceau and her two sisters were assigned to the 1899 fleet maneuvers, which lasted from 5 to 25 July; during the exercises, Marceau was sent to the port of Bonifacio, Corsica, to demonstrate the suitability of the harbor for a squadron of ironclads. In 1900, the ship was replaced in the torpedo school by Magenta. In the 1890s, the French began rebuilding older ironclads to prolong their useful lives, and reconstructions for the three Marceaus were authorized in early 1900. Marceau remained nominally assigned to the Reserve Division in early 1900, but she lay at Toulon and did not see activity with the rest of the unit. On 30 August 1900, Marceau returned to La Seyne for a major reconstruction. Her heavy military masts were cut down, her engines were modernized, and her boilers were replaced with sixteen Niclausse boilers. Another 138.6 mm gun was installed in the bow under the forecastle. The work was completed in May 1902, and Marceau underwent a series of sea trials for the remainder of the year. She did not return to active service with the fleet, however, and was thereafter used as a training ship based in Toulon. In 1906, she was converted into a training ship for torpedo operators in Toulon. She served in that capacity from 1907 to 1910, then as a training vessel for electricians from 1911 to 1912. She reverted to training torpedo crews from 1912 to 1914. After the outbreak of World War I in August 1914, Marceau was converted into a floating workshop to support torpedo boats and submarines. She was initially based in Malta, but was later moved to Corfu and then to Brindisi in January 1918; at the last of the three locations, she served as the command ship for the 1st Submarine Squadron. After the war, in December, she was sent