Captain Horatio Hornblower R.N.

This stunning naval battle scene, courtesy of Warner Bros., is taken from the film Captain Horatio Hornblower R.N., which was released 70 years ago, with Gregory Peck in the lead role.
Captain Horatio Hornblower (a.k.a. Captain Horatio Hornblower R.N. in the UK, "R.N." standing for "Royal Navy"), is a British-American naval swashbuckling war film in Technicolor by Warner Bros. Pictures in 1951, and produced by Gerry Mitchell, directed by Raoul Walsh, staring Gregory Peck, Virginia Mayo, Robert Beatty and Terence Morgan.
The film is based on three of C. S. Forester's Horatio Hornblower novels: The Happy Return (1937), A Ship of the Line (1938), and Flying Colours (1938). Forester is credited with the screen adaptation.
This scene depicts the engagement, during the Napoleonic Wars in 1807, between Captain Horatio Hornblower's 38-gun frigate HMS Lydia and the much more powerful Spanish warship, the 60-gun Natividad.