Question: Northwest Passage is a 26-episode half-hour adventure television series, about an American colonial frontiersman, who served in the British army during what?

Context articles: Northwest Passage (TV series)
Pilot (Twin Peaks)
Robert Rogers (soldier)
Border Patrol (U.S. TV series)
Acapulco (TV series)
Appointment with Adventure
The Troubleshooters (1959 TV series)
Klondike (TV series)
Straightaway
Brave Eagle

Northwest Passage is a 26-episode half-hour adventure television series produced by Metro Goldwyn Mayer about Major Robert Rogers during the time of the French and Indian War (1756–1763).
 The show derived its title and the main characters Rogers, Towne, and Marriner from the 1937 novel of the same name by Kenneth Roberts, and from the 1940 MGM feature film based on the novel.
 The scope of the novel was much broader than that of the series, and the second half of the book included an historically based attempt by Rogers to find a water route through North America as a "passage" to the Pacific Ocean.
 This attempt, lending its name to the novel and used by Roberts as a metaphor for the questing human spirit, is referenced in the first episode.
The pilot episode, also known as Northwest Passage, of the mystery television series "Twin Peaks" premiered on the ABC Network on Sunday, April 8, 1990.
 It was written by series creators Mark Frost and David Lynch, and directed by Lynch.
 The pilot follows the characters of Dale Cooper and Harry S. Truman as they investigate the death of popular high school student Laura Palmer; Cooper believes the murder has connections to a murder case that occurred a year earlier.
 In addition to setting the tone for the show, the episode sets up several character and story arcs and marked the appearance of several recurring characters.
 The episode received a strong Nielsen household rating compared to other season one episodes and was well received by fans and critics alike.
 The original title for the series was "Northwest Passage", but this was later changed.
Robert Rogers (7 November 1731 – 18 May 1795) was an American colonial frontiersman.
 Rogers served in the British army during both the French and Indian War and the American Revolution.
 During the French and Indian War, Rogers raised and commanded the famous Rogers' Rangers, trained for raiding and close combat behind enemy lines.
Border Patrol is a 34-episode syndicated half-hour adventure/drama television series which aired in the United States during calendar year 1959, with Richard Webb cast as Don Jagger, the fictitious deputy chief of the Border Patrol.
 Webb earlier portrayed the title role of "Captain Midnight", a 1954-1956 CBS television series based on an earlier radio program.
Acapulco is an American half-hour adventure series that aired on NBC in 1961.
 It is notable for providing Telly Savalas ("Kojak") with his first regularly recurring role in a television series.
Appointment with Adventure is a half-hour adventure/dramatic anthology television series broadcast live on CBS from 1955–1956.
 The program has no host.
 It aired at 10 p.m. EST on the Sunday evening schedule between the better known "Alfred Hitchcock Presents" and "What's My Line?
" It ran opposite "The Loretta Young Show" on NBC and "Life Begins at Eighty", a panel discussion series hosted by Jack Barry on ABC.
The Troubleshooters is an American 26-segment half-hour adventure series starring Keenan Wynn (1916–1986) as Kodiak and Bob Mathias (1930–2006) as Frank Dugan.
 The show aired on NBC Television from September 11, 1959, to April 10, 1960.
 Based on events at international construction sites, the program was directed by Robert Altman early in his career.
 It was the first series offered by United Artists Television.
Klondike is a 17-episode half-hour American Western/Northern television series starring Ralph Taeger and James Coburn that aired on NBC.
 The series premiered on October 10, 1960 and ran until February 13, 1961, facing stiff competition from "The Danny Thomas Show" on CBS and the second half of the first-season detective series "Surfside 6" starring Troy Donahue on ABC.
 "Klondike" followed Dale Robertson's "Tales of Wells Fargo" on the NBC schedule.
Straightaway is a 26-week half-hour adventure/drama television series which aired on ABC during the 1961–1962 season – the story of two young men who operate a garage and engage in auto racing.
 John Ashley and Brian Kelly played race car designers Clipper Hamilton and Scott Ross, respectively.
 Scott designs the vehicles, and Clipper is the mechanic.
 Asa Maynor was cast in four episodes as Dixie.
 Most episodes center on the clients who bring a race car to the Straightaway Garage.
Brave Eagle is a 26-episode half-hour western television series which aired on CBS from September 28, 1955, to March 14, 1956, with rebroadcasts continuing until June 6.
 Keith Larsen, who was of Norwegian descent, starred as Brave Eagle, a peaceful young Cheyenne chief.