RN Subs

1892	Hebe 1882 - 1919	Launched
1916	G 9 (I 1C)	Launched
1916	G 12 (I 4C)	Completed
1933	Salmon (N 65)	Laid Down
1936	O 20 (Dutch)	Laid down
1940	Rorqual (N 74)	HMS Rorqual makes an unsuccesful torpedo attack on an Italian submarine in the Strait of Otranto.
1941	Thunderbolt (N 25)	HMS Thunderbolt fires torpedoes at the German submarine U-557 in the North Atlantic. The torpedoes miss.
1942	Umbra (P 35)	HMS Umbra fires torpedoes at the Italian battleship Littorio but the torpedoes miss the target. Later HMS Umbra torpedoes and sinks the Italian heavy cruiser Trento.
1943	Ultor (P 53)	HMS Ultor sinks the Italian auxiliary minesweeper Tullio/No.92
1944	Satyr (P 214)	HMS Satyr sank the German submarine U-987 in the North Sea west of Narvik.
1945	Taciturn (P 334)	HMS Taciturn sinks a Japanese air warning picket hulk and the Japanese auxiliary submarine chaser Cha 105 with gunfire in the Madoera Strait to the north of Surabaya, Java, Netherlands East Indies.
1954	Porpoise (S 01)	Laid Down

The History Of The Submarine Attack Teacher

From the inception of the Submarine Service in 1901 all the way through to the early years of WW1 the standard method of teaching embryonic submarine commanding officers, and maintaining commanding officers' skill levels, was for submarines to practice attacking surface ships at sea. This was costly in terms of ships, submarines, manpower and, of course, fuel - coal first then oil. The expansion of the Submarine Service with the war increased the demand for the services. At the same time, however, boats were away on patrol and time between patrols was necessary for maintenance. Moreover, there were very few German ships at sea and so commanding officers were not getting the practice they needed in their attacking skills. The resolution was an attack teacher

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