According the the Walker County AlGenWeb Page, Walker County also provided a substaintial number of people for the 1st Alabama Union Cavalry. I have copied a portion of the page.
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1st Alabama Cavalry (USA)

Only Winston Co. provided more men for this unit than Walker Co

URL:

http://www.people.virginia.edu/~bd2m/algenweb/walker/home.html#Civil%20War%20Information