Question: What is a 1940 biographical film which tells the story of Knute Rockne, Notre Dame football coach, and stars  Pat O'Brien portraying the role of Rockne and Ronald Reagan as player nicknamed "The Gipper" who was selected as Notre Dame's first Walter Camp All-American ?

Context articles: George Gipp
Notre Dame Box
Cartier Field
Eddie Scharer
Eric Hansen (sportswriter)
James Heathman
Tall Grass Game
Tommy Mills
Frank Leahy
Knute Rockne, All American

George Gipp (February 18, 1895 – December 14, 1920), nicknamed "The Gipper", was a college football player who played for the University of Notre Dame.
 Gipp was selected as Notre Dame's first Walter Camp All-American. Gipp played several positions, particularly halfback, quarterback, and punter.
The Notre Dame Box is a variation of the single-wing formation used in American football, with great success by Notre Dame in college football and the Green Bay Packers of the 1920s and 1930s in the NFL.
 Green Bay's coach, Curly Lambeau, learned the Notre Dame Box while playing for Knute Rockne in the late 1910s.
 Rockne learned it from Jesse Harper, who learned it from coach Amos Alonzo Stagg.
 It contained two tight ends, and 4 backs.
 The formation often featured an "unbalanced line" where the center (that is, the player who snapped the ball) was not strictly in the "center" of the line, but close to the weakside.
Cartier Field was a stadium in South Bend, Indiana.
 It hosted the University of Notre Dame Fighting Irish football team from 1900 to 1928, and held nearly 30,000 people at its peak.
 The stands were torn down after the 1928 season to make room for Notre Dame Stadium, which opened in 1930.
 Notre Dame played its entire 1929 schedule away from campus ("home" games were at Chicago's Soldier Field), but nevertheless went 9-0 and won the National Championship.
 At Coach Knute Rockne's insistence, Cartier Field's grass was transplanted into Notre Dame Stadium.
Edward Scharer (January 26, 1902 – May 5, 1989) was a professional football player from Toledo, Ohio.
 He attended and played his college football at the University of Notre Dame and University of Detroit Mercy.
 While at Notre Dame, Scharer caused a rift between the college's president, Father Charles L. O'Donnell and Knute Rockne.
 In 1925 O'Donnell expelled Scharer from Notre Dame, for "breaches of discipline".
 This led to a protest by Scharer's sponsor, Bill Hayes, a contractor from Saint Louis.
 Rockne then argued on Scharer's behalf for months to O'Donnell.
 Finally Scharer was allowed to play for the 1925 season.
Eric C. Hansen is an American sportswriter with the "South Bend Tribune".
 The University of Notre Dame football beat writer and an assistant sports editor for the newspaper, Hansen has also written two books on Notre Dame football.
 "Stadium Stories: Notre Dame Fighting Irish: Colorful Tales of the Blue and Gold" (2004) won a first-place prize for non-fiction books from the Indiana chapter of the Society of Professional Journalists.
 The book recounted many tales of Notre Dame's football history.
 In 2005 Hansen published "Notre Dame Fighting Irish: Where Have You Gone?"
, a collection of stories and interviews about former Notre Dame football players.
 Hansen has won a number of national writing awards from the Football Writers Association of America, and was a member of the FWAA committee that chose the 2006 college All-American team.
James Easter Heathman (April 7, 1917 – January 29, 2008), also known as J. E. Heathman, was an American former farmer and U.S. Army veteran, who, as a teenager in 1931, witnessed and discovered the crash of a Transcontinental & Western Air airliner, which killed eight people, most notably University of Notre Dame football coach, Knute Rockne.
 Heathman, who was 13 years old at the time he discovered the plane crash with his father on March 31, 1931, was the last living witness to the plane crash.
 Heathman later became a Knute Rockne historian and often led free tours of Notre Dame fans to the site of the crash, especially during the last 20 years of his life.
The Tall Grass Game refers to the 1928 Notre Dame vs. Wisconsin football game played on October 6, 1928, between the Notre Dame Fighting Irish and Wisconsin Badgers.
 Notre Dame, coached by Knute Rockne, arrived in Madison, Wisconsin, only to find that the grass on the football field at Camp Randall Stadium had not been mowed in a week.
 Rumor was that Wisconsin coach Glenn Thistlethwaite wanted to slow down the speedy Notre Dame Irish players.
 Rockne demanded the field be trimmed and Thistelwaite refused.
Thomas Emmet Mills (April 5, 1883 – February 25, 1944) was an American football player, coach of football, basketball, and baseball, and college athletics administrator.
 He served as the head football coach at Creighton University (1915–1919), Beloit College (1920–1925), Georgetown University (1930–1932), and Arkansas State College (1934–1935), compiling a career college football record of 63–45–12.
 Mills was the head baseball coach at the University of Notre Dame from 1927 to 1929, during which time he was also an assistant football coach at the school under Knute Rockne.
 In addition, Mills was the head basketball coach at Creighton (1916–1920), Beloit (1920–1923), and Arkansas State (1935–1936), amassing a career college basketball record of 107–25.
 Mills died at the age of 60 on February 25, 1944 of a heart attack at the Rockne Memorial Field House in Notre Dame, Indiana.
 He served as the director of the field house for the four years before his death.
Francis William Leahy (August 27, 1908 – June 21, 1973) was an American football player, coach, college athletics administrator, and professional sports executive.
 He served as the head football coach at Boston College from 1939 to 1940 and at the University of Notre Dame from 1941 to 1943 and again from 1946 to 1953, compiling a career college football record of 107–13–9.
 His winning percentage of .864 is the second best in NCAA Division I football history, trailing only that of fellow Notre Dame Fighting Irish coach, Knute Rockne, for whom Leahy played from 1928 to 1930.
 Leahy played on two Notre Dame teams that won national championships, in 1929 and 1930, and coached four more, in 1943, 1946, 1947, and 1949.
 Leahy was also the athletic director at Notre Dame from 1947 until 1949 when he passed the role to the Fighting Irish basketball coach, Moose Krause, so that he could focus on football coaching.
 Leahy served as the general manager for the Los Angeles Chargers of the American Football League (AFL) during their inaugural season in 1960.
 He was inducted into the College Football Hall of Fame as a coach in 1970.
Knute Rockne, All American is a 1940 biographical film which tells the story of Knute Rockne, Notre Dame football coach.
 It stars Pat O'Brien portraying the role of Rockne and Ronald Reagan as player George Gipp, a.k.a. "The Gipper," as well as Gale Page, Donald Crisp, Albert Bassermann, Owen Davis, Jr., Nick Lukats, Kane Richmond, William Marshall and William Byrne.
 It also includes cameos by legendary football coaches "Pop" Warner, Amos Alonzo Stagg, William H. Spaulding, and Howard Jones, playing themselves.