 | John Gregson | ... | Capt. Bell, HMS Exeter |
 | Anthony Quayle | ... | Cdre. Harwood, HMS Ajax |
 | Ian Hunter | ... | Capt. Woodhouse, HMS Ajax |

| Jack Gwillim | ... | Capt. Parry, HMNZS Achilles |
 | Bernard Lee | ... | Capt. Dove, MS Africa Shell |
 | Lionel Murton | ... | Mike Fowler, Montevideo |
 | Anthony Bushell | ... | Millington Drake, British Minister, Uruguay |
 | Peter Illing | ... | Dr. Guani, Uruguayan Foreign Minister |

| Michael Goodliffe | ... | Capt. McCall, R.N., British Naval Attache, Buenos Aires |
 | Patrick Macnee | ... | Lt. Cmdr. Medley, HMS Ajax |
 | John Chandos | ... | Dr. Langmann, German Minister, Uruguay |
 | Douglas Wilmer | ... | M. Desmoulins, French Minister, Uruguay |
 | William Squire | ... | Ray Martin, Montevideo |
 | Roger Delgado | ... | Capt. Varela, Uruguyan Navy |
 | Andrew Cruickshank | ... | Capt. Stubbs, Doric Star |

| Christopher Lee | ... | Manolo |
 | Edward Atienza | ... | Pop |
 | April Olrich | ... | Dolores |

| Peter Finch | ... | Capt. Langsdorff, Admiral Graff Spee |
 | María Mercedes | ... | Madame X (credit only) |

| John Schlesinger | ... | Prisoner on Graf Spee |
 | John Le Mesurier | ... | Rev. George Groves, Padre, HMS Exeter |
| rest of cast listed alphabetically: |
 | David Farrar | ... | Narrator |
 | John Merivale | ... | Cowburn, Pilot, HMNZS Achilles |
 | Douglas Argent | ... | Sub. Lieutenant, HMS Ajax (uncredited) |
 | Vincent Ball | ... | Barnes, HMNZS Achilles (uncredited) |
 | Ken Barker | ... | Marine Officer / HMS Ajax (uncredited) |
 | Michael Barnes | ... | Midshipman, HMS Ajax (uncredited) |
 | Raymond Barrie | ... | Shirley, HMNZS Achilles (uncredited) |
 | Terence Bayler | ... | Stoker, HMNZS Achilles (uncredited) |
 | Alan Beale | ... | Capt. Pttinger, prisoner on Graf Spee (uncredited) |
 | Richard Beale | ... | Captain Pottinger (uncredited) |
 | David Benson | ... | Marine Officer, HMS Ajax (uncredited) |
 | John Britton | ... | Navigator, HMS Ajax (uncredited) |
 | Robert Bruce | ... | Lt. Cmdr. Smith, HMS Exeter (uncredited) |
 | Anna Burden | ... | Madame Desmoulins, Montevideo (uncredited) |
 | Richard Burrell | ... | Navigator (HMS Exeter) (uncredited) |
 | Tony Burton | ... | Young Sailor, Aft-conning, HMS Exeter (uncredited) |
 | David Cameron | ... | Pilot Officer Lewin, pilot, spotter plane, HMS Ajax (uncredited) |
 | Alan Casley | ... | Rating, Aft-conning, HMS Exeter (uncredited) |
 | Ronald Clarke | ... | Prisoner on Graf Spee (uncredited) |
 | Michael Collins | ... | Chief Yeoman, HMS Ajax (uncredited) |
 | James Copeland | ... | Chief Yeoman, HMNZS Achilles (uncredited) |
 | Tita Dane | ... | (uncredited) |
 | Gron Davies | ... | Chief Engineer, Trevannionion, prisoner on Graf Spee (uncredited) |
 | Denton De Gray | ... | Observer Kearney, Spotter plane, HMS Ajax (uncredited) |
 | Maxwell Denne | ... | Petty Officer, HMNZS Achilles (uncredited) |
 | Captain Patrick Dove | ... | Capt., Streonshalh, prisoner on Graf Spee (uncredited) |
 | Peter Dyneley | ... | Captain, Newton Beach, prisoner on Graf Spee (uncredited) |
 | Eynon Evans | ... | Chief Engineer, Newton Beach, prisoner on Graf Spee (uncredited) |
 | Jack Faint | ... | Chief Officer, Ashlea, prisoner on Graf Spee (uncredited) |
 | Peter Fontaine | ... | Gunnery Officer, HMS Ajax (uncredited) |
 | John Forbes-Robertson | ... | Lt. McBarnett, HMS Exeter (uncredited) |
 | Frank Forsyth | ... | Petty Officer, Bridge, HMS Ajax (uncredited) |
 | Barry Foster | ... | Bill Roper, Capt. Bell's messenger, HMS Exeter (uncredited) |
 | Colin Free | ... | 2nd Messenger, HMS Ajax (uncredited) |
 | Richard George | ... | Chief Officer, Trevannion, prisoner on Graf Spee (uncredited) |
 | Keith Grieve | ... | Sick Bay P.O., HMNZS Achilles (uncredited) |
 | Lucia Guillon | ... | Telephone Girl, Montevideo (uncredited) |
 | Peter Halliday | ... | Guani's Secretary, Montevideo (uncredited) |
 | Ken Hayward | ... | Spotting Officer, Gunnery Control, HMS Exeter (uncredited) |
 | Patrick Horgan | ... | Signalman, HMNZS Achilles (uncredited) |
 | Helen Horton | ... | (uncredited) |
 | Mary Jones | ... | Miss Shaw, Millington Drake's secretary (uncredited) |
 | Kerry Jordan | ... | O.S. Rogers, HMNZS Achilles (uncredited) |
 | Patrick Jordan | ... | Signalman, Aft-conning, HMS Exeter (uncredited) |
 | Marvin Kane | ... | (uncredited) |
 | Howard Lang | ... | 'Guns', HMS Exeter (uncredited) |
 | Frank Lloyd | ... | Messenger, HMNZS Achilles (uncredited) |
 | Cyril Luckham | ... | Lt. Jasper Abbot, HMNZS Achilles (uncredited) |
 | Kenneth Luckman | ... | Mess P.O., HMNZS Achilles (uncredited) |
 | Ivor Mairants | ... | Guitarist accompanying Dolores in Montevideo (uncredited) |
 | Alan Masterson | ... | Midshipman, HMS Exeter (uncredited) |
 | Jack Mayne | ... | (uncredited) |
 | Lane Meddick | ... | P.O. Stacey, HMNZS Achilles (uncredited) |
 | John Merrivale | ... | Cowburn, HMNZS Achilles (uncredited) |
 | Kenneth Midwood | ... | Petty Officer, Gunnery Control, HMS Exeter (uncredited) |
 | Donald Moffat | ... | Swanston, Look Out, HMS Ajax (uncredited) |
 | George Murcell | ... | Chief Officer, Newton Beach (uncredited) |
 | Anthony Newley | ... | Radio Operator, Tairoa, prisoner on Graf Spee (uncredited) |
 | Joseph O'Conner | ... | Chief Engineer, Doric Star, prisoner on Graf Spee (uncredited) |
 | David Paltenghi | ... | Customs Officer, Montevideo (uncredited) |
 | Conrad Phillips | ... | Lt. Washbourne, Gunnery Officer, HMS Achilles (uncredited) |
 | Ambrosine Phillpotts | ... | Mrs. Millington-Drake, Montevideo (uncredited) |
 | Columba Powell | ... | Lost child in crowd (uncredited) |
 | Edward Powell | ... | Chief Officer, Huntsman, prisoner on Graf Spree (uncredited) |
 | Irene Prador | ... | (uncredited) |
 | Peter Prowse | ... | Look Out, HMS Exeter (uncredited) |
 | Roy Purcell | ... | Duty Officer Pennefeather, HMS Ajax (uncredited) |
 | Rive Rola | ... | (uncredited) |
 | Alan Rolfe | ... | Petty Officer, HMS Exeter (uncredited) |
 | David Rose | ... | Boy Dorset, HMNZS Achilles (uncredited) |

| Peter Scott | ... | 1st Messenger, HMS Ajax (uncredited) |
 | Peter Smallwood | ... | Spotting Officer, HMS Ajax (uncredited) |
 | Muriel Smith | ... | Dolores, Montevideo (uncredited) (singing voice) |
 | Julian Somers | ... | Quartermaster on Graf Spee (uncredited) |
 | Barry Steele | ... | Midshipman, HMS Ajax (uncredited) |
 | Graham Stewart | ... | Signalman, HMS Exeter (uncredited) |
 | Nigel Stock | ... | Chief Officer, Tairoa, prisoner on Graf Spee (uncredited) |
 | Alan Townsend | ... | Duty Officer, HMS Ajax (uncredited) |
 | Guy Verney | ... | Cmdr. Graham, HMS Exeter (uncredited) |
 | Tony Wager | ... | Look Out, HMS Ajax (uncredited) |
 | Colin Wall | ... | Boy Bugler, HMS Exeter (uncredited) |
 | John Warren | ... | Chief Yeoman Signals, HMS Exeter (uncredited) |
 | Patrick Westwood | ... | Archer, HMS Ajax (uncredited) |
 | George Whiting | ... | Chief Engineer, Aft-conning, HMS Exeter (uncredited) |
 | Ian Whittaker | ... | Messenger, Boiler Room, HMNZS Achilles (uncredited) |
 | David Williams | ... | Look Out, HMS Exeter (uncredited) |
 | Neil Wilson | ... | Mess P.O., HMNZS Achilles (uncredited) |
 | Brian Worth | ... | Radio Operator, Doric Star, prisoner on Graf Spee (uncredited) |
Michael Powell and Emeric Pressburger are probably best known for their mystical, romantic films like: 'A Matter of Life and Death'; 'Black Narcissus', and 'The Red Shoes'.
'Battle of the River Plate' is a decent film, but it does have some awkward lapses. There is some excellent footage shot at sea using veteran Royal Navy ships. Unfortunately this sits uneasily with the studio sets. During the battle scenes I had the uneasy feeling someone out of shot was throwing buckets of water in the air to simulate shell-fire.
Instead of indulging in Technicolor, I feel the producers should have gone for the harsher monochrome which 'The Cruel Sea' and 'Sink the Bismarck!' use so well. Black and white photography also makes the shift between location and studio work much less obvious.
There are some good performances in the film, notably Peter Finch as Langsdorff. I remember seeing newsreel footage of the real Langsdorff attending the funeral of his men in Montevideo, he gave a German Naval salute instead of the Nazi version. His portrayal as a 'decent' German has a basis in fact.
The battle of the River Plate was the last Naval action to take place without the benefit of technical advances such as radar. It was a fine piece of seamanship and the story deserved to be told. At the end of this film, unfortunately, you can't help feeling it could have been told better.