Statistics for occurrence #1 of “Washington, D. C.” in chapter 20, regiment MI4, section c.20.73 of Frederick H. Dyer, Compendium of the War of the Rebellion: Regimental Histories:

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Organized at Adrian, Michigan, and mustered in June 20, 1861. Left State for Washington, D. C. , June 26. Attached to Wilcox's Brigade, Heintzelman's Division, McDowell's Army of Northeastern Virginia, to August, 1861. Sherman's Brigade, Division of the Potomac, to October, 1861. Mo...
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