NFL Game Summary - Pittsburgh vs. Minnesota

London, England (Sports Network) - Adrian Peterson helped the Minnesota Vikings temporarily right the ship in their trip overseas to London.

And the defense finally held a second-half lead.

Peterson ran for 140 yards and two touchdowns in the Vikings' 34-27 win over the Steelers, sending Pittsburgh to its first 0-4 start since 1968.

The Steelers (0-4) trailed 34-17 heading into the fourth quarter, but fought back and had possession of the football at its own 22-yard line with 1:50 left and down by a touchdown.

Ben Roethlisberger, who was 36-of-51 for 383 yards with a touchdown and interception, drove the Steelers to the Minnesota 6-yard line in the final seconds. Everson Griffen, though, sacked Roethlisberger and forced a fumble on 3rd-and-goal. Minnesota's Kevin Williams fell on top of the ball and Matt Cassel took a knee to seal the outcome for the Vikings (1-3).

The highly-respected Steelers defense has yet to force a turnover this season.