MADISON, Wis. - A cool and gloomy October day at Camp Randall Stadium saw a defensive battle in Big Ten play as Iowa claimed a 15-6 victory over Wisconsin.

Leshon Williams scored the game's lone touchdown on an 82-yard breakaway and finished with 174 yards rushing as Iowa (6-1, 3-1 Big Ten) defeated Wisconsin (4-2, 2-1) to maintain possession of the Heartland Trophy, the 72-pound brass bull that goes to the winner of this annual matchup.

Both team's lost starting players to first-half injuries. Iowa tight end Erick All was carted into the locker room after getting injured while making a 5-yard catch on the Hawkeyes' second series. Wisconsin lost quarterback Mordecai late in the second quarter when he was following through on a pass and his throwing hand hit the helmet of Iowa linebacker Jay Higgins. Wisconsin quarterback Braedyn Locke, a Mississippi State transfer, stepped in for the Badgers.

All's injury was a huge setback for an Iowa offense that already lost starting quarterback Cade McNamara to a season-ending knee injury and tight end Luke Lachey to a likely season-ending ankle injury.

With Iowa facing third-and-2 early in the second quarter, Williams broke free about a dozen yards downfield and raced down the right sideline. After that touchdown, Iowa gained 3 net yards over its next six series, all three-and-outs. Wisconsin cut the margin to 7-6 when it drove 60 yards on each of its first two second-half series and capped both with Nathanial Vakos field goals, one from 36 yards out and the other from 52.

Iowa extended its lead to 10-6 on Drew Stevens' 48-yard field goal with 13:08 left. Yahya Black sacked Locke and forced a fumble that Wisconsin tackle Riley Mahlman recovered in the end zone for a safety with 12:15 remaining.

Wisconsin's late rally was ended when Iowa's Aaron Graves forced a Locke fumble that Higgins recovered at the Badgers' 39, setting up Stevens' 40-yard field goal with 1:55 left.

Iowa punter Tory Taylor averaged 50.6 yards on his 10 punts, while Iowa's quarterback Deacon Hill finished just 6 of 14 for 37 yards.

Wisconsin travels to Illinois next Saturday. Kickoff is set for 2:30 p.m. CT with television viewing information still to be announced.

The AP contributed to this article.