[1] The Chiefs joined the Bonham Boosters, Ardmore Blues, Cleburne Railroaders, Durant Educators, Gainesville Blue Ribbons, Lawton Medicine Men and Wichita Falls Irish Lads teams in beginning Texas–Oklahoma League play on April 25, 1911.
The Gainesville and Lawton teams had disbanded in June, before Altus, whose folding corresponded with the end of the first half of the split–season schedule for the Texas–Oklahoma League.
In the playoffs, Wichita Falls refused to play game four after a financial dispute and Cleburne was awarded the championship.
[9] The facility was shared with amateur teams of the era, as indicated by press reports referring games played at the "League Park" that also involved pregame festivities at the square.
[8] On November 11, 1918, former Chiefs player Calvin Bryant was killed in battle during World War I, while serving for the U.S. Army in France.