page_title: Early history of American football
section_title: Interference
hierarchical_section_title: Early history of American football / Early history of intercollegiate football (1869–1932) / Period of the American Intercollegiate Football Association (1876–1893) / Interference
caption_attribution_description: English: Behind Interference, an American football illustration.
context_page_description: The early history of American football can be traced to early versions of rugby football and association football. Both games have their origin in varieties of football played in Britain in the mid–19th century, in which a football is kicked at a goal or run over a line, which in turn were based on the varieties of English public school football games.
  American football resulted from several major divergences from association football and rugby football, most notably the rule changes instituted by Walter Camp, a Yale University and Hopkins School graduate considered to be the "father of gridiron football". Among these important changes were the introduction of the line of scrimmage, of down-and-distance rules and of the legalization of interference.
  In the late nineteenth and early twentieth centuries, gameplay developments by college coaches such as Eddie Cochems, Amos Alonzo Stagg, Parke H. Davis, Knute Rockne, John Heisman, and Glenn "Pop" Warner helped take advantage of the newly introduced forward pass. The popularity of college football grew in the United States for the first half of the 20th century.
context_section_description: The last, and arguably most important innovation, which would at last make American football uniquely "American", was the legalization of interference, or blocking, a tactic which was highly illegal under the rugby-style rules. Interference remains strictly illegal in both rugby codes to today. The prohibition of interference in the rugby game stems from the game's strict enforcement of its offside rule, which prohibited any player on the team with possession of the ball to loiter between the ball and the goal. At first, American players would find creative ways of aiding the runner by pretending to accidentally knock into defenders trying to tackle the runner. When Walter Camp witnessed this tactic being employed against during a game he refereed between Harvard and Princeton in 1879, he was at first appalled, but the next year had adopted the blocking tactics for his own team at Yale.
  During the 1880s and 1890s, teams developed increasingly complex blocking tactics including the interlocking interference technique known as the Flying wedge or "V-trick formation", which was first employed by Richard Hodge at Princeton in 1884 in a game against Penn, however, Princeton put the tactic aside for the next 4 years, only to revive it again in 1888 to combat the three-time All-American Yale guard Pudge Heffelfinger.
  Heffelfinger soon figured out how to break up the formation by leaping high in the air with his legs tucked under him, striking the V like a human cannonball. In 1892, during a game against Yale, a Harvard fan and student Lorin F. Deland first introduced the flying wedge as a kickoff play, in which two five man squads would line up about 25 yards behind the kicker, only to converge in a perfect flying wedge running downfield, where Harvard was able to trap the ball and hand it off to the speedy All-American Charley Brewer inside the wedge.
  Despite their effectiveness, the flying wedge, "V-trick formation" and other tactics which involved interlocking interference, were outlawed in 1905 through the efforts of the rule committee led by Parke H. Davis, because of its contribution to serious injury. Non-interlocking interference remains a basic element of modern American football, with many complex schemes being developed and implemented over the years, including zone blocking and pass blocking.
caption: Behind Interference, by Frederic Remington (1893).
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