Looking back at my post, I see that I included two of the three URL's consulted. The third, a history of Woodruff's Arkansas Battery, is here:

http://www.civilwarancestor.com/STORE/files/Ebook0111.htm

Other statements concerning Garrity's and Dent's Alabama Batteries were based on personal research on these two commands. A good battery history for Ketchum's/Garrity's Alabama State Artillery appears a "Record of the Alabama State Artillery from its Organization in May 1836 to the Surrender in April 1865 and from its Re-organization Jany 1872 to Jany 1875," in Alabama Historical Quarterly, XX (1958), 141-447.

By the way, Garrity was an Irishman from New York who ran a bookstore in Mobile before the war.