F9 was an F-class submarine in commission in the Italian Regia Marina (Royal Navy) from 1916 to 1928. She took part in conducting antisubmarine patrols in the Mediterranean Sea during the Mediterranean U-boat campaign and seeing service in the Adriatic Campaign.
Design
Construction and commissioning
F9 was laid down by FIAT-San Giorgio at Muggiano, Italy, on 1915. She was launched on 1916 and commissioned on 1916.
Service history After F9 completed workups, the Italian Regia Marina (Royal Navy) assigned her to duty with the La Spezia Maritime Command on 1917 during the Mediterranean U-boat campaign of World War I. She conducted several antisubmarine patrols in the northern Tyrrhenian Sea.
In March 1917, F9 was transferred to the 1st Submarine Squadron at Venice and her sister ship was reassigned to the Brindisi Submarine Squadron, and the two submarines set out on their transfer voyage in company. During their voyage, they were involved in a friendly fire incident on when the Italian destroyer and torpedo boat mistook them for Central Powers submarines and opened fire on them off Messina, Sicily. The two submarines quickly submerged and avoided damage.
The 1st Submarine Squadron assigned F9 to a base at Porto Corsini, from which she operated in the Adriatic Sea during the Adriatic Campaign. She conducted patrols along the coast of Dalmatia through the end of World War I in November 1918, but without noteworthy results.
After World War I, F9 continued to operate in the Adriatic Sea, participating in maneuvers and conducting training cruises. She was decommissioned and stricken from the navy list on 1 August 1928. She subsequently was scrapped.
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