This could be your Phillip Dugan, Ensign, of the Wigfall Guards

Philip/Phillip Dugan, 35, Private, Capt. William Edgar’s Company A, Light Artillery, Texas Volunteers,* enlisted May 9, 1862 at Houston, Tex. by Capt. Wm. Edgar for the war, captured at Natchitochas March 21, 1864, received at New Orleans, La., March 26, exchanged at Red River Landing, July 22, 1864, no further records

* This organization was eventually designated the 1st Texas Field Battery and assigned to the 4th Battalion Field Artillery

Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Texas