 After the outbreak of World War I in August 1914, Marceau was converted into a floating workshop to support torpedo boats and submarines. She was initially based in Malta, but was later moved to Corfu and then to Bizerte in 1918. She was stricken from the naval register on 1 October 1920, and sold to a shipbreaking firm based in Toulon in 1921. While she was being towed to Toulon, a storm caused her to run aground off Bizerte. She remained visible there until the 1930s.
