Answer by taking a quote from the following article:

John F. Maulbetsch (June 20, 1890 - September 14, 1950) was an All-American football halfback at Adrian College in 1911 and for the University of Michigan Wolverines from 1914 to 1916. He is also a member of the College Football Hall of Fame. After playing with an independent football team in Ann Arbor and at Adrian College, Maulbetsch became one of the most famous American football players in 1914 while playing for the University of Michigan. Maulbetsch became known as the "Human Bullet" because of his unusual low, line-plunging style of play, and was also known as the "Featherweight Fullback" because of his light weight and small size.

Maulbetsch's breakthrough came on October 31, 1914, in front of 30,000 fans at Harvard. The game was one of the most anticipated matches of the year. A special train brought Michigan fans to Cambridge, Massachusetts, and hundreds of Michigan alumni from the East were on hand as "reinforcements." Though Harvard prevailed, 7-0, Maulbetsch was the big story in papers across the country. Writers from Ring Lardner to Damon Runyon told the story of Maulbetsch's performance. Lardner said: "If anyone tells you the East plays the best brand of football, Maulbetsch shot that theory full of holes." According to Runyon, the Wolverines used "the mighty Maulbetsch as their battering ram", and he "gained enough ground against Harvard to bury a German army corps." Football writer Frank G. Menke said: "No westerner ever created half the stir in the east as did this Michigander . . . His peculiar, baffling style of attack, backed by phenomenal strength almost always earned for him gains of 5 to 20 yards every time he was called upon to carry the ball." Another writer noted Maulbetsch's skill as a "line breaker" as he "carried the ball repeatedly through the Harvard line and into the secondary defense with bullet-like rushes that upset tackler after tackler." Maulbetsch was responsible for four-fifths of Michigan's ground gains, and on several occasions his dives reportedly "had so much power that he dove right through a double line of crimson players and went sprawling on the ground twelve to twenty feet clear of the double line."  While every report indicates that Maulbetsch had a big day, the accounts vary dramatically as to exactly how many yards he gained. Frank Menke reported after the game that Maulbetsch gained 300 yards. A 1938 newspaper account said he "gained 350 yards from scrimmage." Yet, his 1951 obituary indicated he gained 133 yards in 30 attempts.  Despite Maulbetsch's efforts, Michigan was never able to punch the ball across the goal line. Many blamed Michigan's quarterback who switched to another back every time after Maulbetsch "took the ball to the shadow of the Crimson goal posts." In answer to the question why Michigan was unable to score, Frank Menke said: "Ask the fellow who quarterbacked for Michigan that day. His actions were too mystifying for the spectators to figure out."  When Harvard reneged on an agreement to play a game in Ann Arbor in 1915, sports writers concluded it was to avoid facing Maulbetsch again. Said one reporter: "When faih Hahvahd [sic] saw what Maulbetsch did in the first clash, it decided it cared to see no more of him. He was too rough."

What happened in the 1914 harvard game
Maulbetsch's breakthrough came on October 31, 1914, in front of 30,000 fans at Harvard.