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Notable events involving Rochester include:

25 Sep 1939
Around 0800 hours (zone -4.5), HMS Manchester (Capt. H.H. Bousfield, RN) and the ships of convoy K 4 (see the event for HMS Manchester for 23 September 1939) were joined in appoximate position 18°30'N, 63°06'E by HMS Rochester (Cdr. G.F. Renwick, RN) and two more merchant ships; Indora (6622 GRT, built 1938), Rohna (8602 GRT, built 1926). (1)

13 Jan 1940
HMS Severn (Lt.Cdr. B.W. Taylor, RN) departed Freetown for Portsmouth. She was part of the ocean escort of convoy SL 16F together with Armed Merchant Cruiser HMS Cheshire (Capt. (Retd.) M.R. Bernard, RN) and the destroyers HMS Hardy (Capt. B.A. Warburton-Lee, RN) and HMS Hostile (Cdr. J.P. Wright, RN).

Besides the escort the convoy was made up of 12 British merchant ships; Adda (7816 GRT, built 1922), Anselm (5954 GRT, built 1935), Baronesa (8663 GRT, built 1918), City of Nagpur (10146 GRT, built 1922), Cordillera (6865 GRT, built 1920), Cumberland (10939 GRT, built 1919), Mahia (10014 GRT, built 1917), Mary Slessor (5027 GRT, built 1930), Orari (10350 GRT, built 1931), Port Sydney (9129 GRT, built 1914), Raranga (10043 GRT, built 1916) and Scientist (6198 GRT, built 1938).

The destroyers departed the convoy on the 20th and then proceeded to Gibraltar. On the 24th the destroyer HMS Viscount (Lt.Cdr. M.S. Townsend, RN) and sloop HMS Rochester (Cdr. G.F. Renwick, RN) took over the escort from the HMS Cheshire and HMS Severn which then proceeded to Plymouth and Portsmouth respectively where they both arrived on the 26th. (2)

16 Jan 1940

Convoy SL 17.

This convoy departed Freetown on 16 January 1940 for the Liverpool where it arrived on 4 February 1940.

The convoy was made up of the following merchant vessels; Clumberhall (British, 5198 GRT, built 1930), Harpasa (British, 5082 GRT, built 1932), Hawnby (British, 5380 GRT, built 1936), King Edgar (British, 4536 GRT, built 1327), Loch Ranza (British, 4958 GRT, built 1934), Marconi (British, 7402 GRT, built 1917), Northmoor (British, 4392 GRT, built 1928), Oswerty Grange (British, 4684 GRT, built 1935), River Lugar (British, 5423 GRT, built 1937), Salvus (British, 4815 GRT, built 1928), Stonepool (British, 4803 GRT, built 1928) and Thomas Holt (British, 3585 GRT, built 1929).

Escort was provided on leaving Freetown by the destroyer HMS Dainty (Cdr. F.M. Walton, RN). On 18 January near Dakar, the armed merchant cruiser HMS Carnarvon Castle (Capt.(Retd.) G.B. Lewis, RN) joined. She remained with the convoy until 2 February. HMS Dainty left the convoy when Carnarvon Castle joined.

A/S escort in the Western Approaches was provided from 2 February onwards by the sloop HMS Rochester (Cdr. G.F. Renwick, RN) and the destroyers HMS Viscount (Lt.Cdr. M.S. Townsend, RN) and HMS Walker (Lt.Cdr. A.A. Tait, RN).

16 Aug 1940
At 13.02 hours on 16 august 1940 U-46 fired three torpedoed on three ships (two passenger ships and one freighter) which partially overlapped in convoy OB-197 (150 miles southwest of Rockall) and observed a hit on the freighter, which was clearly damaged, as the bow was deeper in the water. The Dutch merchant ship Alcinous (6,189 tons) was hit on the port side by one torpedo and caught fire, which could be extinguished after long work. The British sloop HMS Rochester (Cdr. G.F. Renwick, RN) supported the damaged ship, which was later towed to Gourock by a British tug. Endrass could not identify his victim, but U-30(Lemp) heard the SSS-signals from the Alcinous.

30 Sep 1940
HMS Rochester (Cdr. G.F. Renwick, RN) picks up 7 survivors from the British merchant Mabriton that was torpedoed and sunk on 25 September 1940 by German U-boat U-32 west-south-west of Rockall in position 56°12'N, 23°00'W.

13 Dec 1940
HMS H 50 (Lt. M. Willmott, RN) conducted A/S exercises off Holyhead with HMS Warwick (Lt.Cdr. M.A.G. Child, RN) and HMS Rochester (Cdr. G.F. Renwick, RN). (3)

19 Oct 1941
German U-boat U-204 was sunk near Tangier, in position 35°46'N, 06°02'W, by depth charges from the British corvette HMS Mallow (Lt. W.R.B. Noall, RNR) and the British sloop HMS Rochester (Cdr. C.B. Allen, RN).

30 Nov 1941
HMS H 50 (Lt. E.T. Stanley, RN) conducted A/S exercises off Lough Foyle with HMS Rochester (Cdr.(Retd.) C.B. Allen, RN), HMS Northern Spray (T/Lt. G.T. Gilbert, RNVR), HMS Leith (Lt.Cdr. E.C. Hulton, RN) and HMS Newport. (4)

6 Feb 1942
German U-boat U-82 was sunk north of the Azores, in position 44°10'N, 23°52'W, by depth charges from the British sloop HMS Rochester (Cdr. C.B. Allen, RN) and the corvette HMS Tamarisk (Lt. S. Ayles, RNR).

24 Mar 1942
HrMs O 10 (Lt. J.H. Geijs, RNN) participated in A/S exercises off Lough Foyle together with HMS Rochester (Cdr. (retired) C.B. Allen, RN), HMS Bulldog (Cdr. M. Richmond, OBE, RN), HMS Ambuscade (Lt.Cdr. R.A. Fell, RN), HMS Sandwich (Lt.Cdr.(Emgy.) R.C. Gervers, RN), HMS Scarborough (Lt.Cdr. E.B. Carnduff, RN), HMS Bradford (Lt.Cdr. J.N.K. Knight, RN) and ORP Blyscawica (Lt.Cdr. T. Gorazdowski, ORP, ORP). (5)

31 Jul 1942
German U-boat U-213 was sunk in the North Atlantic south-east of the Azores, in position 36°45'N, 22°50'W by depth charges from the British sloops HMS Erne (Lt.Cdr. E.D.J. Abbot, RN), HMS Rochester (Cdr. C.B. Allen, RN) and HMS Sandwich (Lt.Cdr. H. Hill, RNR).

28 Aug 1942
HMS Rochester (Cdr. C.B. Allen, RN) picks up 63 survivors from the British merchant City of Cardiff that was torpedoed and sunk by German U-boat U-566 west-north-west of Lisbon.

6 Mar 1943
HMS H 28 (Lt. K.H. Martin, RN) conducted A/S exercises off Lough Foyle with HMS Scarborough (Lt.Cdr. E.B. Carnduff, RN), HMS Coltsfoot (T/Lt. the Hon. W.K. Rous, RNVR), HMS Spiraea (Lt. A.H. Pierce, OBE, RNR), HMS Rochester (Cdr. H.V. King, OBE, RN), HNoMS Rose and HMS Fleetwood (Cdr. W.B. Piggott, OBE, RD, RNR). (6)

28 Jun 1943
HMS H 32 (Lt. J.A.R. Troup, DSC, RN) conducted A/S exercises off Lough Foyle with HMS Rochester (Cdr. H.V. King, OBE, RN) and HMS Geranium (T/Lt. A.R.J. Tilston, DSC, RNR). (7)

30 Jun 1943
HMS H 32 (Lt. J.A.R. Troup, DSC, RN) conducted A/S exercises off Lough Foyle with HMS Rochester (Cdr. H.V. King, OBE, RN), HMS Geranium (T/Lt. A.R.J. Tilston, DSC, RNR), HMS Lagan (Lt.Cdr. A. Ayre, RNR) and HMS Primrose (T/Lt. P.E. Kitto, RNR). (7)

3 Jul 1943
HMS H 34 (T/Lt. R.L. Willoughby, RNR) conducted A/S exercises off Lough Foyle with HMS Sabre and HMS Fame (Capt. R. Heathcote, DSO, RN), HMS Rochester (Cdr. H.V. King, OBE, RN) and HMS Azalea (Lt. G.C. Geddes, RNR). (8)

4 Jul 1943
HMS P 511 (Lt. C.W. Taylor, RNR) conducted A/S exercises off Lough Foyle together with HMS Rochester (Cdr. H.V. King, OBE, RN), HMS Geranium (T/Lt. A.R.J. Tilston, DSC, RNR), HMS Mignonette (Lt. H.H. Brown, RNR), HMS Balsam (Lt. J.E.L. Peters, RNVR), HMS Coltsfoot (T/Lt. G.W. Rayner, RNVR) and HMS Azalea (Lt. G.C. Geddes, RNR). (9)

15 Jul 1943
German U-boat U-135 was sunk in the Atlantic, in position 28°20'N, 13°17'W, by the British sloop HMS Rochester (Cdr. H.V. King, OBE, RN) and the British corvettes HMS Mignonette (Lt. H.H. Brown, RNR) and HMS Balsam (Lt. J.E.L. Peters, RNVR) and an American Catalina aircraft (VP-92).

5 Feb 1944
HMS H 44 (Lt. P.N. Joyce, RN) conducted A/S exercises off Lough Foyle with HMS Scarborough (Lt.Cdr. E.B. Carnduff, RN) and HMS Rochester (Cdr. H.V. King, OBE, DSO, RN). (10)

26 Apr 1944
HMS H 50 (T/Lt. A.F. Wicker, RNVR) conducted A/S exercises off Lough Foyle with HMCS Summerside (T/Lt. G. St. A.Mongenais, RCNVR), HMS Mignonette (Lt. H.H. Brown, DSC, RNR), HMS Rochester (Cdr. H.V. King, OBE, DSO, RN) and HMS Scarborough (Lt.Cdr. E.B. Carnduff, RN). (11)