In 2019 the NFL celebrated its 100th season. During that historic year the league selected an All-Time Team of 100 former star players. Among them were seven from before football's free substitution rule (1920-1945), two-way players who were skilled at both offense and defense. They were: Sammy Baugh (Quarterback), Dutch Clark (Running Back), Dan Fortmann (Guard), Mel Hein (Center), Cal Hubbard (Tackle), Don Hutson (Wide Receiver) and Bill Hewitt (Defensive End).

There were more than just seven great players from those years, when men in leather helmets played multiple positions on dirt fields for modest salaries. This book ranks the NFL's top two-way players, with detailed biographies and analysis by their contemporaries.