Allied Warships

HMS Cynthia (J 345)

Minesweeper of the Auk class

NavyThe Royal Navy
PennantJ 345 
Built byAssociated Shipbuilders (Seattle, Washington, U.S.A.) 
Ordered6 Dec 1941 
Laid down7 Sep 1942 
Launched27 Nov 1942 
Commissioned7 Dec 1943 
End service20 Jan 1947 

Returned to the United States Navy on 20 January 1947.  

Commands listed for HMS Cynthia (J 345)

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1T/A/Lt.Cdr. Charles Leslie Chatwin, RNVR3 Dec 19431 Nov 1945

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Notable events involving Cynthia include:

6 May 1945

Operation Cleaver.

Entry of a naval surface force into the Skagerrak and Kattegat.

The following forces took part in this operation;
' Force 5 ' which was made up of the light cruisers HMS Birmingham (Capt. H.W. Williams, RN), HMS Dido (Capt. R.F. Elkins, OBE, RN) and the destroyers HMS Zephyr (Capt. J.H. Allison, DSO and Bar, RN), HMS Zealous (Cdr. R.F. Jessel, DSO, DSC and Bar, RN), HMS Zest (Lt.Cdr. R.B.N. Hicks, DSO, RN) and HMS Zodiac (Lt.Cdr. H.R. Rycroft, DSC, RN).
This force departed Rosyth in the evening of the 6th.

' Force 6 ' which was made up of the heavy cruiser HMS Norfolk (Capt. J.G.Y. Loveband, RN, flying the flag of Vice-Admiral R.R. McGrigor, CB, DSO, RN) and the destroyers HMS Scourge (Lt.Cdr. C.G.H. Brown, DSC, RN, with Capt. P.G.L. Cazalet, DSC, RN on board), HMS Savage (Lt.Cdr. C.W. Malins, DSO, DSC and Bar, RN), HMS Obedient (Lt.Cdr. H. Kirkwood, DSC and Bar, RN), HMS Offa (Lt.Cdr. E.M. Thorpe, DSO, RN), HMS Opportune (Cdr. R.E.D. Ryder, VC, RN), HMS Zambesi (Lt.Cdr. J.M. Palmer, RN) and HMS Carysfort (Lt.Cdr. L.St.G. Rich, DSO and Bar, RN). This force departed Scapa flow early the 7th except to joined the escort carriers HMS Queen (A/Capt. K.J. D'Arcy, DSO, RN), HMS Searcher (Capt. J.W. Grant, DSO, RN), HMS Trumpeter (A/Capt. K.S. Colquhoun, RN) which had still been at sea after operation Judgement together with the escort carrier HMS Campania (Capt. C.B. Alers-Hankey, DSC, RN) and the destroyers HMS Obdurate (Lt.Cdr. R.D. Franks, DSO, DSC, OBE, RN), HNoMS Stord (Lt.Cdr. H. Øi) and ORP Piorun (Lt.Cdr. J. Tchorznicki, ORP). The cruisers and the destroyers joined the escort carriers around 1000B/7.

HMS Campania, HMS Obdurate, HNoMS Stord and ORP Piorun then parted company.

And the 40th Minesweeping Flotilla made up of HMS Catharine (Cdr. Kenneth Hillam Fraser, RN), 6541 HMS Cynthia (T/A/Lt.Cdr. C.L. Chatwin, RNVR), HMS Elfreda (T/A/Lt.Cdr. L. Jolly, RNVR), HMS Grecian (T/A/Cdr. C.R. Fraser, DSC and Bar, RNR) and HMS Gazelle (Lt.Cdr. J.D. Sutcliffe, RN), HMS Maenad (Cdr. C.E. Duggan, RD, RNR), HMS Steadfast (T/A/Lt. A.H. Hall, RNVR) and HMS Tattoo (Lt.Cdr.(Retd.) F.G. Rogers, RD, RNR). They departed Rosyth of the 6th.

Force 5 and the 40th M/S Flotilla arrived at Copenhagen, Denmark on 9 May. The 40th M/S Flotilla swept Force 5 through the minefields.

Force 6 returned to Scapa Flow on 10 May. (1)


  1. ADM 199/1440

ADM numbers indicate documents at the British National Archives at Kew, London.

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