The ships of the "Formidable" class had uneventful peacetime careers. All three ships of the class served with the Mediterranean Fleet as their first station; in 1908, "Formidable" and "Irresistible" were recalled to the Channel Fleet, though the former remained there for just a year, transferring to the Home Fleet and then shortly thereafter to the Atlantic Fleet in 1909. That year, "Implacable" joined her sister ship in the Atlantic Fleet. Between 1911 and 1912, all three ships were assigned to the 5th Battle Squadron of the Home fleet, where they remained for the rest of their peacetime careers. Throughout their peacetime careers, the ships were repeatedly overhauled and had minor modifications carried out, including alterations to their light armament, addition of searchlights, and installation of improved fire-control and wireless systems.