The role of Michigan troops in the demise of Jeb Stuart is rather well-known. The part they played out West regarding a similar Southern cavalier may be less so.
From Annals of the War, the 1879 collection of Philadelphia Weekly Times articles, is the account written by H.V. Redfield of the "Death of General John H. Morgan". It recounts how Morgan met his fate "at the hands of Tennessee Unionists--the Thirteenth and Ninth Tennessee Cavalry regiments, aided by the Tenth Michigan." After Morgan's amazing escape from the Ohio Penitentiary, he began operating in East Tennessee and planned an attack on a brigade of Tennessee and Michigan troops near Knoxville. On September 3, 1864, he moved his troops to Greenville, famous as the home of Andrew Johnson, 17th President. Morgan went to sleep in town and was awakened during the night to find the Union troops he had planned to attack surrounding the house. This time, however, his escape went awry, and he was fatally shot by a trooper of the 13th Tennessee. "The forces engaged on the Union side were" the 13th and 8th Tennessee and "Tenth Michigan, Major Newell" commanding.
From the Michigan AG's report: "The 10th Michigan Cavalry, then in command of Major Newell, encamped near Bulls' Gap, is ordered by General Gillam to attack the enemy's camp [along the Greenville road]. Marching all night, he dismounts his men at daylight and charges into Morgan's first camp, driving the enemy in hot haste, leaving their breakfast half cooked, and their dead and wounded. Reaching the second camp, the enemy is found in better condition. General Gillam comes up with the 9th Tennessee Cavalry (Colonel Brownlow), orders that regiment to the charge with sabres, but a sharp fire from the enemy drove the regiment back. The 13th Tennessee Cavalry (Colonel Miller) comes up, the enemy driving the 9th advances rapidly, with a large cavalry force, at least 1,000 strong, filling the road from fence to fence. The 10th Michigan opens fire at about half pistol range with carbines, and soon the road is blocked with dead and wounded men and horses. The enemy, confused, hastily falls back, pursued to the woods, but is shelled out and pushes on to Greenville; is again charged on, becomes demoralized, breaks up, and flees. Morgan and staff are discovered under shelter of a house; a company of the 13th Tennessee is sent to capture him; he rushes for his horse, but is shot in the attempt by a sergeant of the company."
Thus did Michigan participate in putting down the Mosby of the West.