Development of Defensive Strategies

One striking aspect of modern football is its emphasis on defense as well as offense. This trend began after World War II (1939-1945), when college teams were allowed free substitution of players—that is, a player could enter and leave the game an unlimited number of times, as long as the ball was not in play during the substitution. This feature of the game led to the modern two-platoon system, in which one group of 11 players enters the game to play offense and a second group enters to play defense. Such a system has fostered the development of individual skills and specialization among players. Defensive football has acquired an extensive terminology of its own. In some ways defense is more complicated than offense, because defensive teams have fewer restrictions on their manner of lining up. Generally, however, the defensive formation is determined by the way the offense lines up. For example, when defending against opponents who are expected to throw many forward passes, a team might use a formation with a four-player line of two ends and two tackles. Three linebackers would stand directly behind the front four. In addition, two cornerbacks placed wider and farther back could defend against mid-range assaults. Two safeties would position themselves deeper to protect against longer aerial attacks. Most of the innovative thinking by coaches in the NFL during the 1970s came on defense. Offensive statistics plummeted as defenses dominated. The newer game demanded speed at every position, in addition to strength and bulk. Great linebacker units with catchy names such as Doomsday in Dallas, Pittsburgh's Steel Curtain, Minnesota's Purple People Eaters, and the Rams' Fearsome Foursome dominated offenses. Teams turned the free safety position over to ferocious hitters such as the Raiders' Jack Tatum and Dallas' Cliff Harris.

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