De'Veon Smith's diving touchdown put Michigan up for good. [Eric Upchurch]

For 40 minutes, Senior Day at Michigan Stadium couldn't have gone much worse. The offense had nothing going with John O'Korn, who looked hesitant and flustered in Wilton Speight's stead. Indiana led 10-6 and looked poised to upset Michigan for the first time since 1987.

O'Korn had thrown for all of 46 yards when he dropped back on third-and-eight from the Michigan 36 with five minutes left in the third quarter. Indiana got instant pressure and O'Korn broke the pocket, jetting down the sideline for 30 yards, Michigan's longest play from scrimmage to that point.

"The opportunity presented itself. I thought I was going to score," O'Korn said, cracking a smile. "Then I got tackled from behind."

De'Veon Smith would not be denied in such fashion. He broke through the line, fended off a tackler, and scraped the ball along the top of the pylon for a spectacular 34-yard diving touchdown.

Following a short Indiana punt against the wind two drives later, Smith burst untouched into the secondary, and tiptoed down the sideline past a dominating block from Kekoa Crawford for a 39-yard score.

"Grinding out first downs. Grinding meat. De'Veon," said Jim Harbaugh, succinctly describing Smith. "It felt like old-fashioned, slobber-knocker football."

Smith accounted for over half of Michigan's total yardage with a career-high 158 yards on 23 carries. As Michigan Stadium turned into a Winter Wonderland in the fourth quarter, his punishing runs salted the game away on a 15-play, 51-yard drive that took nearly nine minutes off the clock and left Indiana with no shot at a comeback.

Michigan Stadium as snow globe. [Bryan Fuller]

While Michigan's offense scuffled early, the defense and special teams kept the Wolverines close enough for the eventual comeback. The defensive front, led by seniors Taco Charlton and Ryan Glasgow, ran rampant in the Hoosier backfield; those two accounted for 5.5 of Michigan's 12 tackles for loss. Ben Gedeon and Mike McCray both had excellent games, and the secondary shut down the passing game, holding the Hoosiers to 6.4 yards per attempt.

While Jabrill Peppers couldn't get much going in his few snaps on offense, he made his presence felt in the other two phases. He repeatedly gave Michigan great field position by fielding IU's line-drive punts, and a pad-popping stop on Richard Lagow in the backfield for one of his two TFLs helped hold the Hoosiers to a field goal on what would be their only scoring drive of the second half.

Special teams played a big part in this victory beyond Peppers's returns. Kenny Allen used the elements to his advantage, pinning Indiana inside their 20-yard line on four of his six punts, and he calmly connected on both of his field-goal attempts. When Peppers wasn't fielding punts, Michigan was blocking them; Michael Jocz and Khaleke Hudson got their hands on a punt apiece to help swing the momentum in Michigan's favor.

That proved enough for Michigan to avoid an upset. A much larger test looms next week in Columbus, of course, with the stakes about as high as they could be. It's yet to be seen if Michigan will have their starting quarterback on the field for the program's most important game since 2006.

"We'll see," Harbaugh said regarding Speight's status this week. "He's day-to-day."