"It would have been a long flight back to take after a loss," Jennings said. "It was a special day. To do this at Wembley Stadium is a once-in-a-lifetime experience."
"We are in unchartered territories and the water is dangerous right now, so we have to stick together and get out of it," Roethlisberger said. "Right now, you could say we're the worst team in the league. That hurts."
Not to be outdone, Peterson ran for a 60-yard touchdown in the second quarter.
Frazier suddenly has a bit of a quarterback controversy as well.
Cassel finished 16-of-25 passing for 248 yards and two touchdowns with no turnovers. But with Ponder hoping to have recovered from a rib injury after the coming bye week, Frazier said he doesn't expect a permanent switch.
"If you're asking, our quarterback is Christian Ponder," Frazier said. "Now we'll discuss a lot of things when we come out of the bye, but ... we're going to enjoy this victory for a little while at least."
Regardless of the quarterback, Peterson and Jennings will pose a threat to any team going forward.
Peterson ran for 140 yards on 23 carries, while Jennings finished with 92 yards on three receptions.
That offset two touchdown runs by Pittsburgh's rookie running back Le'Veon Bell, who made his long-awaited debut for the Steelers after a foot injury. He gave the team its first rushing touchdowns of the season by breaking off to the right for an 8-yard score to make it 10-7, somersaulting into the end zone, and later when he pulled Pittsburgh within 3 by plowing in from the 1-yard line in the third quarter.
But Peterson and Jennings added their second touchdowns to help Minnesota pull away, although Pittsburgh made sure it was a tense finish after Jerricho Cotchery caught a 15-yard touchdown pass in the fourth quarter, and Shaun Suisham kicked a 28-yard field goal to make it a one-possession game with 3:40 left.
The Steelers got the ball back on their own 22-yard line with 1:43 left and no timeouts, and Roethlisberger completed six passes to get a first-and-goal at the 6. But after spiking the ball, he overthrew Cotchery in the end zone and was stripped on the next play.
Roethlisberger finished 36-for-51 passing for 383 yards, with one touchdown and one interception.
NOTES: British heavyweight Boxer David Haye blew the Vikings' giant horn when the team ran onto the field before the game, while Kiss member Gene Simmons sang the American national anthem. ... This is the seventh year of the International Series in Britain, but the first year Wembley will host two NFL games, with the Jacksonville Jaguars playing the San Francisco 49ers on Oct. 27. ... Jennings has seven career 70-yard touchdown catches. Jerry Rice holds the record with nine.