Coaching with conviction: Vince Lombardi's extraordinary success as the legendary coach of the Green Bay Packers demonstrates the dramatic difference principle-based leadership can make.(HISTORY--LEADERSHIP)

On December 31, 1967, it was 13 degrees below zero with a wind chill of minus 46 in Green Bay, Wisconsin. Despite the weather, two football teams prepared to face each other on the frozen expanse of Lambeau Field. The team from Texas, the fearsome Dallas Cowboys, stood frigidly on the sidelines of the football field and, according to Green Bay Packer fullback Chuck Mercein, "looked like earthmen on Mars." Unlike the Cowboys, the players on the Green Bay sideline were accustomed to the harsh Wisconsin climate. But even they were surprised by the unexpectedly brutal arctic conditions. "It's just too cold to play," Willie Wood, the Green Bay Packers' safety said. "They're ...