In 1916, République was sent to cover the withdrawal from the Gallipoli campaign, and thereafter became involved in events in Greece, being stationed in Salonika to put pressure on the Greek government to enter the war on the side of the Allies.

[2] République's main battery consisted of four Canon de 305 mm Modèle 1893/96 guns mounted in two twin-gun turrets, one forward and one aft.

The secondary battery consisted of eighteen Canon de 164 mm Modèle 1893 guns; twelve were mounted in twin turrets, and six were in casemates in the hull.

Also in 1915, the 47 mm guns located on either side of the bridge were removed and the two on the aft superstructure were moved to the roof of the rear turret.

[8] From 16 to 26 January, she steamed from Brest to Toulon, where she conducted wireless telegraphy tests in conjunction with the armored cruiser Kléber and the Eiffel Tower from 14 to 17 February.

[9] On 13 January 1908, République and the battleships Patrie, Charlemagne, Gaulois, Saint Louis, Masséna, and Jauréguiberry steamed to Golfe-Juan and then to Villefranche-sur-Mer, where they remained for more than a month.

The ships then steamed north to La Pallice, where they conducted tests with their wireless sets and shooting training in Quiberon Bay.

[10] République joined Patrie, Justice, Vérité, Démocratie, and Suffren for a simulated attack on the port of Nice on 18 February.

[11] During the maneuvers, Patrie launched a torpedo that accidentally hit République, damaging her hull and forcing her to put into Toulon for repairs.

The fleet returned to Toulon on 29 April, where Fallières doubled the crews' rations and suspended any punishments to thank the men for their performance.

République and the rest of 1st Squadron and the armored cruisers Ernest Renan and Léon Gambetta went on a cruise in the western Mediterranean in May and June, visiting a number of ports including Cagliari, Bizerte, Bône, Philippeville, Algiers, and Bougie.

Admiral Jauréguiberry took the fleet to sea on 11 September for maneuvers and visits to Golfe-Juan and Marseilles, returning to port five days later.

A 37-metric-ton (36-long-ton; 41-short-ton) piece of armor plate struck République on the starboard quarter directly behind the main battery turret and killed twenty-three men.

On an investigation of the damage, it was found that a melinite shell from Liberté hit the ship in the same location and exploded, punching a hole in the armored deck.

[15][16] On 24 April 1912, République went to sea with Justice for gunnery training off the Hyères roadstead; they were joined by Patrie and Vérité the next day.

Admiral Augustin Boué de Lapeyrère inspected both battleship squadrons in Golfe-Juan from 2 to 12 July, after which the ships cruised first to Corsica and then to Algeria.

The 2nd Squadron departed Toulon on 23 August with the armored cruisers Jules Ferry and Edgar Quinet and two destroyer flotillas to conduct training exercises in the Atlantic.

While en route to Brest, the ships stopped in Tangier, Royan, Le Verdon, La Pallice, Quiberon Bay, and Cherbourg.

[17] The 2nd Squadron ships conducted torpedo training on 19 January 1914, and later that month they steamed to Bizerte, returning to Toulon on 6 February.

Accordingly, République and the rest of the 2nd Squadron were sent to Algiers, where they joined a group of seven passenger ships that had a contingent of 7,000 troops from XIX Corps aboard.

In the ensuing Battle of Antivari, Boué de Lapeyrère initially ordered his battleships to fire warning shots, but this caused confusion among the fleet's gunners that allowed Ulan to escape.

[21] The French fleet patrolled the southern end of the Adriatic for the next three days with the expectation that the Austro-Hungarians would counterattack, but their opponent never arrived.

[22][23][24] The fleet continued these operations in October and November, including a sweep off the coast of Montenegro to cover a group of merchant vessels replenishing their coal there.

The patrols continued through late December, when an Austro-Hungarian U-boat torpedoed Jean Bart, leading to the decision by the French naval command to withdraw the main battle fleet from direct operations in the Adriatic.

While in Lemnos on the night of 17/18 November, République broke free from her anchors and ran aground in the harbor, though she was refloated with help from several tugboats and British vessels.

[29][30][31] On 20 January 1918, the French received word that the battlecruiser Goeben (now under the Ottoman flag as Yavuz Sultan Selim) would sortie, so République and Patrie prepared for action.

[32] République continued in service as a training vessel after the war; on 1 July 1919 she was formally assigned to the school of armorers and gunners.