Following the outbreak of World War I in July 1914, France announced general mobilization on 1 August. The next day, Admiral Augustin Boué de Lapeyrère ordered the entire French fleet to begin raising steam at 22:15 so the ships could sortie early the next day. The bulk of the fleet, including the "Division de complément", was sent to French North Africa, where they escorted the vital troop convoys carrying elements of the French Army from North Africa back to France to counter the expected German invasion. The French fleet was tasked with guarding against a possible attack by the German battlecruiser , which instead fled to the Ottoman Empire. As part of her mission, "Jauréguiberry" was sent to Oran, French Algeria on 4 August, in company with "Bouvet", "Suffren", and "Gaulois". She also escorted a convoy of Indian troops passing through the Mediterranean in September. Beginning in December, "Jauréguiberry" was stationed at Bizerte, remaining there until February 1915 when she sailed to Port Said to become flagship of the Syrian Division, commanded by Admiral Louis Dartige du Fournet. At that time, the division included "Saint Louis", the coast defence battleship , and "D'Entrecasteaux".