MADISON, Wis. (AP) -Running back P.J. Hill tied a school record with five touchdowns as No. 7 Wisconsin shook off a first-half scare from The Citadel in a 45-31 victory on Saturday.

The Badgers (3-0) extended the nation's longest active winning streak to 12 games, and never trailed in Saturday's game. But for a half, it looked like they were in danger of becoming the second Big Ten powerhouse to be upset by a team from what used to be known as Division I-AA this season.

The Citadel (2-1), a member of the NCAA Football Championship Subdivision, matched Wisconsin touchdown-for-touchdown and went into halftime tied at 21 with one of the Big Ten's best.

But the Bulldogs couldn't stop the Badgers' top dog, running back P.J. Hill.

Hill had all three of the Badgers' touchdowns in the first half - then scored his fourth of the day on the first drive in the second half to give Wisconsin a 28-21 lead.

After that, the Bulldogs' offense ran out of answers.

Wisconsin's highly touted defense finally asserted itself on the next series with a sack by blitzing safety Aubrey Pleasant and an interception by safety Shane Carter after Citadel quarterback Duran Lawson threw into double-coverage down the right sideline.

Wisconsin still couldn't quite put the game out of reach, settling for a 22-yard field goal by Taylor Mehlhaff to take a 31-21 lead despite having first-and-goal at the Bulldogs' 4-yard line after a pass interference penalty.

The Badgers' defense forced another three-and-out and Hill broke the game open on an 11-yard touchdown pass from Badgers quarterback Tyler Donovan, becoming the fifth player in school history to score five touchdowns in a game.

Hill gained 168 yards rushing on 25 carries and caught two passes for 20 yards.