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According to Broadfoot Roster, Wagener's Co. is listed as Company A German Artillery.

A Company: Captain D. Werner 8 October 1861; Captain Fred W. Wagener took command on 19 May 1863; Captain C. Norden. Organized during the Fall of 1861. Armament: two 6-pound smoothbore cannon, two 12-pound howitzers, 3 May 1864; two 12-pound howitzers, two 12-pound Napoleons, 6 January 1865. Part of the forces surrendered by General Joseph E. Johnston on 26 April 1865 at Durham Station, Orange County, North Carolina. Assignments: Department of South Carolina, November, 1861; 2nd Military District of South Caroina, December 1861 - July 1862; 1st Military District of South Carolina, July 1862 – June 1863; 4th Military District of South Carolina, June – August 1863; Unattached, 1st Military District of South Carolina, August – September 1863; Unattached, 2nd Sub-division, 1st Military District of South Carolina, September 1863; Unattached, 1st Military District of South Carolina, October 1863 – July 1864; Ripley’s Brigade, July – December 1864; 5th Battalion, Reserve Artillery, December 1864 – January 1865; Roberson’s Brigade, Wright’s Division, January – February 1885. Battles: Port Royal, 7 November 1861; Charleston Harbor, August – September 1863; Carolinas Campaign.

From this page:

http://members.tripod.com/~Corktree/South_Carolina_Artillery_Units_in_the_War_of_the_Rebellion