McGilligan was captured June 11, 1864 near Trevillian Station, Va. He was sent to Fortress Monroe on the 20th of June and was transferred to Elmira Prison, N.Y. July 25, '64.
Pvt. McGilligan was released May 15, 1865 at Elmira. He told the Union that he was transcripted May 1862, he was an Irishman and had never been naturalized. He went on to say that he desired to remain North. When he left, his residence was listed as being Jersey City, N.J.