1. Gen. Perrin's Report: Colonel Abner Perrin's Report of the Battle of Gettysburg, McGowan's Brigade, July 1, 2 and 3, 1863 Date: 1863-08-13 Description: Major General Perrin's detailed account of McGowan's Brigade, the infantry unit he led, during the Battle of Gettysburg. Mentioned are the efforts of various officers as well as the tactical maneuvers during the three-day battle.