Elmer Ellsworth's first friend in Chicago was his business partner, Arthur Devereaux. They started a patent business together.
Due to some sort of problem, they lost the business. EE stayed in Chicago, & AD went back home to Salem, MA. While there, he again became involved with local militia companies, and began the Salem Zouaves.
He met up with EE again during the Rock Star Summer Tour of the U.S. Zouaves, under Ellsworth's direction. EE left MA, but almost a year later, Lincoln called for 75,000 men. The Salem Zouaves responded, serving a 90-day tour.
When they disbanded, Devereaux immediately rejoined the Army, becoming a hero at Gettysburg and ending his career as a brevet brigadier general.
Elmer Ellsworth hung out with the right kind of people. I might do more on Devereaux here in a day or so. "What think you?"