While the Dardenelles WAS an abject failure, it’s main purpose was to relieve pressure on the Russians who were hard pushed on their Caucus front.
What ? No mention of Dardanelles Campaign in 1915 during World War I. The fiasco that almost finished Churchill's poltical career ? Entante lost six battleships , two destroyers , various other pupport and escort craft and on land more than 250.000 men (British Commonwealth , ANZACs and French) killed , wounded , missing , captured. EDIT : Sorry rvsakhadeo mentioned six minutes before me.