Question: Bronco is a Western series on ABC from 1958 through 1962, the program starred Ty Hardin as Bronco Layne, a former Confederate officer who wandered the Old West, meeting such well-known individuals as Thomas Coleman "Cole" Younger (January 15, 1844 – March 21, 1916) was an American Confederate guerrilla during the American Civil War and later an outlaw leader with which Gang?

Context articles: Galvanized Yankees
Cole Younger
Battle of Fairfax Court House (June 1861)
Cheyenne (board game)
Lawman (TV series)
Ty Hardin
St. John Richardson Liddell
Escort West
Bronco (TV series)
The Outlaw Josey Wales

Galvanized Yankees was a term from the American Civil War denoting former Confederate prisoners of war who swore allegiance to the United States and joined the Union Army.
 Approximately 5,600 former Confederate soldiers enlisted in the "United States Volunteers", organized into six regiments of infantry between January 1864 and November 1866.
 Of those, more than 250 had begun their service as Union soldiers, were captured in battle, then enlisted in prison to join a regiment of the Confederate States Army.
 They surrendered to Union forces in December 1864 and were held by the United States as deserters, but were saved from prosecution by being enlisted in the 5th and 6th U.S. Volunteers.
 An additional 800 former Confederates served in volunteer regiments raised by the states, forming ten companies.
 Four of those companies saw combat in the Western Theater against the Confederate Army, two served on the western frontier, and one became an independent company of U.S. Volunteers, serving in Minnesota.
Thomas Coleman "Cole" Younger (January 15, 1844 – March 21, 1916) was an American Confederate guerrilla during the American Civil War and later an outlaw leader with the James–Younger Gang.
 He was the eldest brother of Jim, John and Bob Younger, who were also members of the gang.
The Battle of Fairfax Court House was one of the first land engagements of the American Civil War, when a Union scouting party clashed with the local militia in the village of Fairfax Court House, Virginia on June 1, 1861.
 It saw the first death in action of a Confederate officer, and the first wounding of a Confederate officer of field grade.
Cheyenne Game (1958) is a Milton Bradley children's board game for two to four players based on the 1957 Golden Globe Award winning ABC Warner Bros. western television series "Cheyenne" (1955-1962) starring Clint Walker.
 The game is a typical track/racing board game.
 A second edition of the game was released during Clint Walker's dispute with Warner Bros. that featured "Bronco" star Ty Hardin on the box cover.
 "Cheyenne" was one of many board games published during the 1950s based on television programs.
Lawman is an American western television series originally telecast on ABC from 1958 to 1962 starring John Russell as Marshal Dan Troop and Peter Brown as Deputy Marshal Johnny McKay.
 The series was set in Laramie, Wyoming during 1879 and the 1880s.
 Warner Bros. already had several western series on the air at the time, having launched "Cheyenne" with Clint Walker as early as 1955.
 The studio continued the trend in 1957 with the additions of "Maverick" with James Garner and Jack Kelly, "Colt .45" with Wayde Preston, and "Sugarfoot" with Will Hutchins.
 One year later, Warner Bros. added "Lawman" and "Bronco" with Ty Hardin.
Orison Whipple Hungerford Jr. (January 1, 1930 – August 3, 2017), known as Ty Hardin, was an American actor best known as the star of the 1958 to 1962 ABC/Warner Bros. Western television series "Bronco".
St. John Richardson Liddell (September 6, 1815 – February 14, 1870) was a prominent Louisiana planter who served as a general in the Confederate States Army during the American Civil War.
 He was an outspoken proponent of Southern emancipation of slaves.
 Liddell was murdered by a former Confederate Officer near his home in 1870.
Escort West is a 1959 Western, first released on Jan. 23, 1959, but sometimes listed as a 1958 release.
 The movie is set after the U.S. Civil War, when a former Confederate officer, played by Victor Mature, and his daughter help some survivors of an Indian massacre.
Bronco is a Western series on ABC from 1958 through 1962.
 It was shown by the BBC in the United Kingdom.
 The program starred Ty Hardin as Bronco Layne, a former Confederate officer who wandered the Old West, meeting such well-known individuals as Wild Bill Hickok, Billy the Kid, Jesse James, Theodore Roosevelt, Belle Starr, Cole Younger, and John Wesley Hardin (the last played by Scott Marlowe).
The Outlaw Josey Wales is a 1976 American revisionist Western DeLuxe Color and Panavision film set during and after the American Civil War.
 It was directed by and starred Clint Eastwood (as the eponymous Josey Wales), with Chief Dan George, Sondra Locke, Sam Bottoms, and Geraldine Keams.
 The film tells the story of Josey Wales, a Missouri farmer whose family is murdered by Union militants during the Civil War.
 Driven to revenge, Wales joins a Confederate guerrilla band and fights in the Civil War.
 After the war, all the fighters in Wales' group except for Wales surrender to Union officers, but they end up being massacred.
 Wales becomes an outlaw and is pursued by bounty hunters and Union soldiers.