In an American football game, each team fields 11 players at any given time. This means there are a total of 22 players on the field during play. These players are divided into three main units ...

Camp introduced standard parameters of the game that all fans recognize today. A line of scrimmage, the system of four downs and the rules of 11 men on the field per side were all pioneered by Camp.

The American football field. The playing surface in an American Football game is called the field. It measures 100 yards long and 53.3 yards wide.

The roots of American football are in rugby football and soccer. The first American football game is seen as being played on Nov. 6, 1869, but the rules were the same as soccer at the time.