[2] The main battery of the Dantons consisted of four Canon de 305 mm (12 in) modèle 1906 mounted in two twin gun turrets, one forward and one aft of the superstructure.

[7] Together with four of her sisters, she participated in a large naval review by the President of France, Armand Fallières, off Cap Brun on 4 September[8] and then the visit by the Navy Minister, Théophile Delcassé on the 8th.

On 3 March 1913 the First Battle Squadron conducted gunnery training off the Îles d'Hyères with the First Lord of the Admiralty, Winston Churchill, observing.

[10] The ship participated in combined fleet maneuvers between Provence and French Tunisia in May–June[11] and the subsequent naval review conducted by the President of the Council, Raymond Poincaré, on 7 June.

[12] Rear Admiral Marie-Jean-Lucien Lacaze relieved Gauchet on 16 August[13] and Mirabeau joined her squadron in its tour of the Eastern Mediterranean in October–December, making port visits in Egypt, Syria, and Greece.

[11] Lacaze shifted his flag to her sister Voltaire on 12 March 1914 and the ship had to briefly withdraw from the grand fleet exercises on 13 May due to engine troubles.

[14] Before the French declared war on the German Empire on the morning of 4 August, Vice Admiral (Vice-amiral) Augustin Boué de Lapeyrère, commander of the 1st Naval Army (1re Armée Navale), as the Mediterranean Squadron had been renamed in 1913, ordered most of his ships to concentrate off the Algerian coast to escort troop convoys to Metropolitan France and to blockade German shipping in the Mediterranean.

[18] On 11 January 1915, the French were alerted that the Austro-Hungarian fleet was going to sortie from its base at Pola, so the Naval Army sailed north to the Albanian coast.

The declaration of war on Austria-Hungary by Italy on 23 May, and the Italian decision to assume responsibility for naval operations in the Adriatic, allowed the French Navy to withdraw to either Malta or Bizerte, Tunisia, to cover the Otranto Barrage.

Greek resistance to the Allied action ended after Mirabeau fired four rounds from her main armament into the city, one of which landed near the Royal Palace.

Afterwards, she spent 1917 based at Corfu or at Mudros to prevent Goeben, by this time transferred to the Ottoman Empire and renamed Yavuz Sultan Selim, from breaking out into the Mediterranean.

[22] After the Armistice of Mudros was signed on 30 October between the Allies and the Ottoman Empire, the ship participated in the early stage of the occupation of Constantinople beginning on 12 November.

After several weeks of effort, the ship was refloated on 6 April and she was towed by the Russian cruiser Kagul and the tugboat Thernomore to a drydock in Sevastopol to repair any damage and to have her equipment reinstalled.

After an inspection of the ship in a drydock, Mirabeau was stricken on 22 August and turned over as compensation to the company that salvaged the pre-dreadnought battleship Liberté.