"Diderot" was based in Toulon throughout 1919 and was modernized in 1922–25 to improve her underwater protection.The ship became a training ship in 1927 and was condemned in on 17 March 1937; sold to M. Gosselin-Duriez on 30 July 1937 for 3,557,010 FF, she arrived at Dunkirk for breaking up on 31 August.