F11 was an F-class submarine in commission in the Italian Regia Marina (Royal Navy) from 1916 to 1919. She took part in seeing service in the Adriatic Campaign.
Design
Construction and commissioning F11 was laid down by FIAT-San Giorgio at Italy, on 1915. She was launched on 1916 and commissioned on 1916.
Service history F11 began operational service in May 1917 with her assignment to the Ancona Maritime Command. Taking part in the Adriatic Campaign of , she conducted 16 offensive war patrols in Austro-Hungarian waters. Her most noteworthy action occurred on 1917, when she and her sister ship intercepted an Austro-Hungarian Navy formation composed of the coastal defense ships and , escorted by torpedo boats, minesweepers, and seaplanes, which was bombarding Italian coastal defenses at Cortellazzo on the Piave River. The two submarines and two MAS boats intervened in an attempt to force the Austro-Hungarian ships to withdraw.
World War I ended in November 1918. F11 was decommissioned on 1919 due to the poor state of her engines. She subsequently was scrapped.
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