The Chicago Bears had one of the league's worst defenses between 2013 and 2014 under former head coach Marc Trestman, but the unit is finally starting to take shape this season under defensive coordinator Vic Fangio.
During Trestman's two-year reign as the team's head coach, Mel Tucker controlled Chicago's defense. Tucker ran his own version of former head coach Lovie Smith's Cover 2 scheme, but the Bears struggled to adapt to Tucker's defense.
In 2013, Chicago's defense allowed an average of 394.6 yards per game—third-most in the NFL. The unit also allowed 29.