During the 2012 football season, William Wylie followed the Prairie School Mustangs across the Pawnee National Grasslands in Eastern Colorado. Prairie is a small K-12 public school and plays a unique style of football known as six-man. Six-man football was developed in 1934 as an alternative means for small high schools to field a football team during the Great Depression. It is a fast-moving game played on an 80 x 40-yard field.