Note that some of some of these reports can be accessed online here--
http://www.sos.mo.gov/archives/provost/provostPDF.asp --notably, one such report that can be accessed here is a report that should give you Ballou's "home county or city, home state, where arrested, when arrested, and remarks...."
And here's an account that gives rank as well as numbers in his command. This from the 1912 "Compendium of History and Biography of Linn County," p. 69--
The 16th Illinois Infantry came from Quincy to Linn county in June. They were the first regular Federal troops to arrive. The company disembarked at Brookfield and at Laclede, some of them remaining at each place, while others were sent to guard the bridges at Locust Creek, Yellow creek and Parson creek. It was believed that those structures were threatened by the enemy. Reconnoitering parties were also sent out. One of these went to Linneus and took some prisoners. The Third Iowa Infantry arrived not long afterwards and encamped at Brookfield. Colonel Morgan then began the organizing of the 18th Missouri Infantry at Laclede. That was in August. Isaac V. Pratt, of Laclede, was the first lieutenant-colonel of this regiment, which was afterwards commanded by Madison Miller and Charles S. Sheldon, of St. Louis. While the 18th Infantry was being organized Colonel Morgan took his regiment, a section of artillery and two companies of cavalry under Captains Love and Loring, and went on a reconnoitering expedition into Chariton and Carroll counties, starting out October 18th. At the crossing of Big Hurricane creek, in Carroll county, Captain Love's company was in the advance. Suddenly shots rang out from the bushes alongside the road and the cavalrymen began falling from their horses. The attack had been made by Confederates, the force numbering about 60 men under Captain Logan Ballow, Fifteen cavalrymen were badly wounded and sixteen horses killed. Before pursuit could be organized the Confederates had retreated and got out of the danger.