Thunderheart is a 1992 contemporary western mystery film directed by Michael Apted from an original screenplay by John Fusco.
 The film is a loosely based fictional portrayal of events relating to the Wounded Knee incident in 1973, when followers of the American Indian Movement seized the South Dakota town of Wounded Knee in protest against federal government policy regarding Native Americans.
 Incorporated in the plot is the character of Ray Levoi, played by actor Val Kilmer, as an FBI agent with Sioux heritage investigating a murder on a Native American reservation.
 Sam Shepard, Graham Greene, Fred Ward and Sheila Tousey star in principal supporting roles.
 Also in 1992, Apted had previously directed a documentary surrounding a Native American activist episode involving the murder of FBI agents titled "Incident at Oglala".
 The documentary depicts the indictment of activist Leonard Peltier during a 1975 shootout on the Pine Ridge Indian Reservation.
Night Mail is a 1936 documentary film about a London, Midland and Scottish Railway (LMS) mail train from London to Scotland, produced by the GPO Film Unit.
 The film ends with a "verse commentary" by W. H. Auden, written for existing footage.
 Benjamin Britten scored the film.
 The film was directed by Harry Watt and Basil Wright, and narrated by John Grierson and Stuart Legg.
 The Brazilian filmmaker Alberto Cavalcanti was sound director.
 The locomotive featured in the film was Royal Scot 6115 "Scots Guardsman", built in 1927.
 The film has become a classic of its own kind, much imitated by adverts and modern film shorts.
 "Night Mail" is widely considered a masterpiece of the British Documentary Film Movement.
Samsara is a 2011 non-narrative documentary film, directed by Ron Fricke and produced by Mark Magidson, who also collaborated on "Baraka" (1992), a film of a similar vein.
 "Samsara" was filmed over five years in 25 countries around the world.
 It was shot in 70 mm format and output to digital format.
 The film premiered at the 2011 Toronto International Film Festival and received a limited release in August 2012.
Samsara: Death and Rebirth in Cambodia is a 1989 short documentary film about the people of Cambodia rebuilding after being ruled by Pol Pot and being sent to Killing Fields.
 The film was directed and produced by Ellen Bruno for her Stanford University master's thesis.
 In 2012, the National Film Registry selected the film for preservation.
The Battle for Whiteclay is a documentary film released in 2008 which chronicles the efforts of Native American activists Frank LaMere (Winnebago), Duane Martin Sr., and Russell Means to end the sale of alcohol in Whiteclay, Nebraska.
 Directed and produced by Mark Vasina, the film covers the economy of the approximately one dozen residents and four liquor stores, which sell nearly 5 million cans of beer annually (12,500 cans a day).
 The largest populated place nearby is the Pine Ridge Indian Reservation across the border in South Dakota; its residents are largely members of the Oglala Sioux Tribe.
Tupac: Resurrection is a 2003 American documentary film about the life and death of rapper Tupac Shakur.
 The film, directed by Lauren Lazin and released by Paramount Pictures, is narrated by Tupac Shakur himself.
 The film was in theaters from November 16, 2003 to December 21, 2003.
 As of July 1, 2008 it had earned over $7.8 million, making it the 21st-highest-grossing documentary film in the United States - (in nominal dollars, from 1982 to the present).
 The film was nominated for the Academy Award for Best Documentary Feature at the 77th Academy Awards.
Incident at Oglala is a 1992 documentary by Michael Apted, narrated by Robert Redford.
 The film documents the deaths of two Federal Bureau of Investigation agents, Jack R. Coler and Ronald A. Williams, on the Pine Ridge Indian Reservation in the summer of 1975.
Forget Us Not is a 2013 feature-length documentary film by Heather Connell, which follows the stories of some of the 5 million non-Jewish Holocaust survivors including artist Ceija Stojka and is narrated by actor Ron Perlman.
 The documentary was released on the festival circuit in August 2013 and has won eight awards to date including Feature Documentary and Editing Awards Of Merit from Accolade Film Competition, Helping Hand International Humanitarian Award from the Rhode Island International Film Festival, Best of Festival at Vancouver's Columbia Gorge International Film Festival, Mark Of Distinction Film at the New York Independent Film Festival and Best Narration and World Peace Impact Award from the Artisan World Peace Hamptons Film Festival and Feature Documentary Audience Award at the First Glance International Film Festival Los Angeles.
Walls of Fire is a 1971 documentary film directed by Herbert Kline and Edmund Penney.
 Narrated by Ricardo Montalbán, this documentary examines the history of Mexican murals and their artists.
 Among the works examined are those by José Clemente Orozco, Diego Rivera and David Alfaro Siqueiros.
 It was nominated for an Academy Award for Best Documentary Feature.
 The documentary was also won a Golden Globe award for Best Documentary film in 1972.
Olivier de Sagazan (born 1959 in Brazzaville, Congo ) is a French artist, painter, sculptor, and performer.
 De Sagazan's work typically centers around the artist building layers of clay and paint onto his own face and body.
 His work was featured in the 2011 documentary film "Samsara" by Ron Fricke.
 He has collaborated with the likes of Mylène Farmer inspiring and appearing in her video for À l'ombre and FKA Twigs for her Performance Piece "Rooms".

Question: Which documentary film was narrated, Samsara or Incident at Oglala?
Answer: Incident at Oglala