The Foudre was first commissioned in 1896 as a torpedo boat tender (Croiseur porte-torpilleurs), with the role of helping bring torpedo boats to the high seas, and launch them for attack.
She was then modified as repair ship in 1907, as a minelayer in 1910, as a seaplane carrier in 1911 (depot, transport, and launch by crane), and seaplane carrier with a flying-off deck in 1913. She was initially converted to carry torpedo-carrying planes in hangars on the main deck. They were lowered on the sea with a crane.[3]
In April 1910, Vice-Admiral Auguste Boué de Lapeyrère, Navy Minister, established a committee to study the usage of balloons and planes by the navy.
On 29 November 1911 a navy airbase was established at Fréjus Saint-Raphaël, and the torpedo boat tender Foudre was sent to the naval yard in Toulon to be converted as a seaplane tender. The ship was fitted out in a totally new way. A deck was installed at the bow for the seaplane to take off. The seaplane would land on the water, and be craned on board for stowing.
A float-equipped Canard Voisin seaplane was bought by the navy for this purpose in December 1911. The Foudre would be stationed at Fréjus, working as a seaplane tender, allowing for stowage, repair and supply of the seaplanes. The ship was armed on 15 April 1912, and trials with the Canard Voisin then started.
On 1 May 1912 the Navy Ministry purchased several more seaplanes, a monoplane Breguet with a single float, a Nieuport with double float, and a converted Farman biplane.
Experiments at sea started with the Foudre in July 1912 during tactical exercises in the Mediterranean. The Canard Voisin, and a new foldable Nieuport were used. During the exercises, in which a wargame simulated the fight of two rival navies, the use of the Nieuport allowed the discovery of a surprise attack by the "adversary". During the summer of 1912 many flights of the Canard Voisin from the Foudre were accomplished in the bay of Saint-Raphaël.
By the middle of 1913, the navy had 11 seaplane pilots. The Foudre was again used in large-scale naval exercises. One of its planes, a Nieuport used for observations, foiled a "surprise attack" by a group of warships. Five more seaplanes were ordered following these exercises.
In November 1913, a 10-meter flying-off deck was installed, with the objective of using it for a Caudron G.3 seaplane. The plane successfully lifted off from the ship on 8 May 1914. At the beginning of the war, the platform was dismantled, and further experiments were postponed to a later date.
During World War I her roles were numerous, ranging from submarine tender to seaplane/aircraft transport, and headquarters ship in 1916. She was employed as an aviation school ship after the war.