Ships
* was a 98-gunTraining establishment
* was a training establishment started at Devonport in 1862, and active until 1929. As training ships were replaced or added to the establishment, each was renamed ''Impregnable'' when she took on the role: ** was the original school ship between 1862 and 1888. ** was HMS ''Impregnable'' between 1885 and 1911, and HMS ''Impregnable I'' between 1911 and 1919. ** was HMS ''Impregnable'' between 1919 and 1929. ** was HMS ''Impregnable II'' between 1911 and 1919, and HMS ''Impregnable (Old)'' between 1919 and 1922. ** was HMS ''Impregnable II'' between 1919 and 1931. ** was HMS ''Impregnable III'' between 1910 and 1922. ** was HMS ''Impregnable III'' between 1922 and 1929. ** was HMS ''Impregnable IV'' between 1915 and 1922. ** was HMS ''Impregnable IV'' between 1919 and 1929. * was a training establishment for 'hostilities only' communications ratings at Plymouth between 1935 and 1947. After decommissioning HMS ''Impregnable'' was reopened soon after, remaining in commission until 1948.References
* {{DEFAULTSORT:Impregnable, Hms Royal Navy ship names