Yahoo Sports reports: The Dallas Cowboys have been responsible for many memorable moments throughout NFL history, but few decisions have had a greater impact than the trade involving Herschel Walker in 1989. More than three decades later, the blockbuster deal continues to be regarded by many as the greatest trade the league has ever seen, largely because of […] The post Dallas Cowboys’ 1989 Move Ranked the Greatest NFL Trade of All Time appeared first on Gridiron Heroics.