[1] In March 2012, Steve Gordon purchased the territory rights based in Chicago as part of the first wave of expansion to begin play in the 2013 season.

[2] The Windy City Wildfire found a home field at Lane Tech College Prep.

Going into the 2014 season, team ownership made the decision to legally change the name of the franchise to the Chicago Wildfire.

In 2015, the organization decided to shift 5 of their 7 home games to Benedictine University, which is located in Lisle, Illinois.

The season yielded an 8–5–1 record, allowing for a third-place finish in the division, and a postseason appearance against the Pittsburgh Thunderbirds.

On January 1, 2017, Steve Gordon signed on Trent Kuhl as General Manager of the Chicago Wildfire.

[3] In 2019, former player Dave Woods, took the reins from Adrian King and became the head coach of the Chicago Wildfire.

While the Union finished third in the division, they did make it to the playoffs, but were narrowly defeated by the Madison Radicals in a thrilling double-overtime match.

This season marked the beginning of a new chapter for the Union as they started hosting games at Martin Stadium at Northwestern University.

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