[3] Petrolia Park hosted several spring training games between Omaha and other upper-level professional teams during that time, including two contests against the St. Louis Browns of the American League.
[4] At the end of their 1920 spring training season, Omaha handed over use of Petrolia Park to the newly formed Okmulgee Drillers of the Class D Western Association.
[5][6] The fairgrounds grandstand used in 1921 was the same one used in the inaugural 1920 season, but the alignment of the field was tilted further to the right to address concerns that the fans' view of players was being obscured by the late afternoon sun.
[9] In 1922, citing dissatisfaction with the fairgrounds site, the City of Okmulgee authorized construction of a new athletic field to host both the Drillers and other sports activities.
[10] In 1926, the Okmulgee Board of Education acquired land at the intersection of East 12th Street and Creek Avenue from New York philanthropist William E. Harmon and a local citizen, where it developed a new athletic field for high school sports.
That complex comprises today's Harmon Athletic Field, which is listed on the National Register of Historic Places and still hosts Okmulgee High School football games.