Mustered into service as a Private on July 29th, 1861
Private Gustin was wounded by a gunshot wound to the right leg just below the knee at the Battle of Brawner Farm on August 28th, 1862. Sometime later in the fall he contracted "disease of the lungs" and was sent to a hospital in Baltimore Maryland. Samuel was discharged from the 19th Indiana on January 5th, 1863 because of his sickness and wound.
On the 25th day of November 1863 he enrolled in Company G of the 124th Indiana Infantry where he served until the end of the war mustering out on August 31st, 1865 while in Greensboro North Carolina.
In a statement after the war another soldier in the 124th Indiana stated that "while marching and counter marching and fighting through Georgia from Resaca to Atlanta in the months of May and June 1864 Gustin injured his legs causing lacerations and while near Kennesaw Mountain Georgia about June 1864 he contracted chronic diarrhea and became affected with rheumatism. He did not recover from said disabilities while in service."
Samuel was so broken down from his illnesses from the war he was unable to perform very much manual labor. As time went on he became totally disabled. Samuel was never able to provide for himself and he never married. He lived with various people in the Randolph / Jay County Indiana area until at least 1889. In August of that year he was living with William H. Richardson in Redkey Indiana.
Samuel filed for a pension in May of 1879. His last known residence was Jay County Indiana. His brother Thomas was also in the 124th Indiana joining the same day as Samuel. He died in October of 1864 while at home in Fairview, Randolph County Indiana and is buried in the Fairview Cemetery.
It is very likely that Samuel Gustin is buried in a unmarked grave in the Fairview Cemetery or in a cemetery near Redkey Indiana.