He was best known for playing football; however, Marshall also competed in baseball,[2] track, boxing, ice hockey and wrestling.

In 1906, Marshall kicked a 48-yard field goal for the Gophers and appeared to single-handedly prevent University of Chicago Maroons star Walter Eckersall from running the ball[4] to beat the Maroons 4-2 (field goals counted as four points).

[4] During his time with the Marines, Marshall also played for and managed Bobby Marshall's All-Stars (1914), captained and managed the independent professional Minneapolis Beavers (1914) and White Fronts (1915), and played as a ringer for West Duluth (1916) and the independent professional Davenport Athletics (1917).

[4] Three years later, at age 50 in 1930, Marshall played for the independent professional Chippewa Falls Marines, and in 1931 he served as line coach for the Ace Box Lunch team in the Minneapolis park league.

)[4] In 1960, Ossie Solem, who had played for the Gophers under Henry L. Williams and then later coached the Minneapolis Marines and at Luther College (Iowa), Drake University, Syracuse University, and Springfield College, told the Minneapolis Star Tribune that “The greatest football player I ever saw anywhere was Bobby Marshall.”[5] Marshall is in the College Football Hall of Fame and the Minnesota Sports Hall of Fame.

Central was the champion of the Twin Cities High Schools for Marshall's junior and senior years, of 1900 and 1901.

[6] Shortly after graduating from the University of Minnesota with a degree in law, Marshall played third base for the Minneapolis "Lund-Lands" for one season, in 1906.

[4] In a 1916 game with the Colored Gophers, Marshall brought in "Cannonball Jackson" a pitcher acquired from J. L. Wilkinson's All Nations team.

He played for the Minneapolis Buffaloes in 1922, and he captained the Askin and Marine Colored Red Sox that same season.

[4] In 1925, Marshall played for the St. Paul Colored Gophers again and then for Billy Potts Motor Company, a.k.a.

He played for the Minneapolis Colored White Sox in 1926 and Johnnie Baker American Legion Post #291 in 1927.

He raced his motorcycle in a state championship in 1914, and he played on independent professional basketball teams in 1925 and 1926, including the Minneapolis Uptowns in 1926.

While in high school, Marshall's mother died, and he began working as a janitor to support his three siblings.

At his retirement from his government job in 1950, he was honored with a testimonial dinner, whose attendees included Minnesota Governor Luther Youngdahl and legendary Gophers football coach Bernie Bierman.