The regiment had 138 casualties during the Seven Days ' Battles .
The regiment lost forty - two percent of the 150 in the Maryland Campaign and more than forty - five percent of the 328 engaged at Gettysburg .
The regiment had 138 casualties during the Seven Days ' Battles and lost forty - two percent of the 150 in the Maryland Campaign and more than forty - five percent of the 328 engaged at Gettysburg .