During the Wars of the First and Second Coalitions, Mont Blanc took part in the last actions of the Glorious First of June, in the Croisière du Grand Hiver, in the Battle of Hyères Islands and in Bruix' expedition of 1799; after peace was restored in the Treaty of Lunéville, she served during the Saint-Domingue expedition.

[1][3] In 1795 she was renamed Républicain, taking part in the Battle of Hyères Islands,[3] and Ganteaume's expedition of 1795, and then became Mont Blanc again in 1796.

Dumanoir commanded the six ship vanguard of the French fleet, with Formidable, Scipion, Duguay-Trouin, Mont Blanc, Intrépide and Neptune.

Nelson's attacks left these ships downwind of the main confrontation and Dumanoir did not immediately obey Villeneuve's orders to return to the battle.

[1] On 4 November 1805, Admiral Sir Richard Strachan, with HMS Caesar, Hero, Courageux, Namur and four frigates, defeated and captured what remained of the squadron at the Battle of Cape Ortegal.