Dragged out Welcher's The Union Army 1861 - 1865. It lists the districts therein, but so far I've seen no mention of the units. There were, off and on, 12 Districts in the Department. Each of those was divided into sub-districts extending out to Colorado Territory, Indian Territory, and Nebraska, to name a few.
If you have access to a good library for Welcher's or the OR cd, you can dig out the buried information.
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__________________ I never knew a man who wished to be himself a slave. Consider if you know any good thing that no man desires for himself. A. Lincoln |