| Navy | The Royal Navy |
| Type | Submarine |
| Class | T |
| Pennant | N 77 |
| Built by | Vickers Armstrong (Barrow-in-Furness, U.K.) |
| Ordered | 6 May 1938 |
| Laid down | 24 Aug 1938 |
| Launched | 14 Nov 1939 |
| Commissioned | 15 Feb 1940 |
| Lost | 2 Nov 1941 |
| Loss position | |
| History | HMS Tetrarch (Lt.Cdr. George Henry Greenway, RN) sailed from Malta on 26 October 1941 for a refit in the U.S.A., via Gibraltar and the U.K. She failed to arrive in Gibraltar on 2nd November and was declared overdue. She is presumed lost on Italian mines off Capo Granditola, Sicily, Italy in late October 1941. |
Commands listed for HMS Tetrarch (N 77)
Please note that we're still working on this section.
| Commander | From | To | |
| 1 | Lt.Cdr. Ronald George Mills, RN | 30 Nov 1939 | 15 Nov 1940 |
| 2 | Lt.Cdr. Richard Micaiah Towgood Peacock, RN | 15 Nov 1940 | 5 Jul 1941 |
| 3 | Lt.Cdr. George Henry Greenway, RN | 5 Jul 1941 | < 2 Nov 41 |
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Noteable events involving Tetrarch include:
23 Apr 1940
HMS Tetrarch (Lt.Cdr. R.G. Mills, RN) torpedoes and sinks the German submarine chaser UJ B / Treff V (330 GRT) in the Skaggerak in position 58º21'N, 10º24'E. (see map)
20 May 1940
HMS Tetrarch (Lt.Cdr. R.G. Mills, RN) captures the Danish fishing vessel Emmanuel in the North Sea in position 56º59'N, 06º58'E. The ship is taken to Leith as a prize. (see map)
20 May 1940
HMS Tetrarch (Lt.Cdr. R.G. Mills, RN) sinks the Danish fishing vessel Terieven with scuttling charges in the North Sea west of Denmark in position 56º55'N, 06º50'E. (see map)
16 Jun 1940
HMS Tetrarch (Lt.Cdr. R.G. Mills, RN) torpedoes and sinks the German tanker Samland (5978 GRT) south-west of Lista, Norway in position 58º12'N, 06º13'E. (see map)
4 Nov 1940
HMS Tetrarch (Lt.Cdr. R.G. Mills, DSC and
Bar, RN) torpedoes and sinks the Italian merchant Snia Amba (2532 GRT) off Benghazi, Libya in position 31º35'N, 19º20'E. (see map)
12 Apr 1941
HMS Tetrarch (Lt.Cdr. R.M.T. Peacock, RN) torpedoes and sinks the Italian tanker Persiano (2474 GRT) about 30 nautical miles north-west of Tripoli, Libya in position 33º29'N, 13º01'E. (see map)
18 May 1941
HMS Tetrarch (Lt.Cdr. R.M.T. Peacock, RN) torpedoes and sinks the Italian merchant Giovinezza (2362 GRT) off Bengasi, Libya in position 31º55'N, 19º55'E. (see map)
22 Jul 1941
HMS Tetrarch (Lt.Cdr. G.H. Greenway, RN) claims to have damaged a sailing vessel with gunfire in the Aegean off Karlovassi.
25 Jul 1941
HMS Tetrarch (Lt.Cdr. G.H. Greenway, RN) attacks the Greek tanker Olympos (5216 GRT) off Gaidero Island, Greece. The vessel is not hit.
27 Jul 1941
HMS Tetrarch (Lt.Cdr. G.H. Greenway, RN) sinks the Italian sailing vessel Nicita with gunfire 5 nautical miles south of Kos, Greece.
23 Aug 1941
HMS Tetrarch (Lt.Cdr. G.H. Greenway, RN) sinks the Italian sailing vessels V 72/Fratelli Garre (413 GRT) and V 113/Francesco Garre (399 GRT) with gunfire in the Gulf of Syrte.
26 Sep 1941
HMS Tetrarch (Lt.Cdr. G.H. Greenway) torpedoes sinks the Italian merchant Citta di Bastia (2499 GRT) in the Aegean Sea about 18 nautical miles south of Milos Island, Greece in position 36º21'N, 24º23'E. (see map)
27 Sep 1941
HMS Tetrarch (Lt.Cdr. G.H. Greenway, RN) sinks the Greek sailing vessel Panagiotis Kramottos (120 GRT) with gunfire south-west of Milos Island, Greece.
28 Sep 1941
HMS Tetrarch (Lt.Cdr. G.H. Greenway, RN) torpedoes and damages the German merchant Yalova (3751 GRT) in the Aegean Sea south of Agios Giorgios Island.
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