The Thirty-Eighth Volunteer Infantry Regiment organized in the summer of 1862 as part of a larger recruiting effort in the state of Massachusetts.
The Thirty-Eighth boarded the B.S. Baltin in Baltimore, Maryland, to join Lt. General John C. Pemberton in Louisiana as part of General Grant's Vicksburg Campaign. The unit saw its first combat at the Battle of Fort Bisland (April 12-13, 1863). In May of 1863, the unit engaged in battle at Sandy Creek, Missouri, and took part in several assaults on Port Hudson.
From the description of Thirty-Eighth Volunteer Infantry Regiment (Mass.) Reports, 1862-1865 (University of Texas Libraries). WorldCat record id: 759405520