- Oliver was a private in Campany D of the 1st Maryland Cavalry -- the same company his brother-in-law Denton Hammond was in. The First Maryland saw no major action during the 3 day Battle of Gettysburg (from 1 July - 3 July 1863) although in the days that followed they were tasked with protecting the retreating Confederate army.
Some time after that Battle, Oliver’s niece, Miss Mary Hammond, received a letter from her “Aunt Serena” who was in Hagerstown, MD, in 1863. “I was called for by one of the Company D a Leu(tenant?) in your Pa’s and Uncle O (‘s) Company who I did not know. he gave his name Dorsey from near Newmarket. He was a very nice looking man. ... he told me all of his company had been killed or taken prisoner, about 2 miles from here.”
So although Denton and Oliver escaped injury and capture during the Battle, in skirmishes afterwards, on 4 July 1863, Oliver and his brother Denton were captured. (The Fort Delaware records say he was captured in “Littleburg, PA” but while there is a Littletown, PA, it is more than 2 miles from Hagerstown, contrary to Serena’s letter. There is, however, a town called Leitersburg, MD, about 2 miles north east of Hagerstown, i.e., in the direction of Gettysburg.)
Denton survived his imprisonment in Fort Delaware, writing often to his daughter and wife. But Oliver entered the prison hospital on 1 March 1864 and died 3 days later of Typhoid Fever. He was 27 years old.
The letters from “Aunt Serena” (who I hvae not been able to identify) also include references to the arrest of “Uncle Ollie.” She writes “[I] will first tell you how very glad I was to receive your last which was quite a satisfactory (relief?) of the Sequel of Uncle Ollie’s arrest here, which I had not heard before.” Since this is the same letter where she refers to “Pa and Uncle O” and we know that OB Hammond was captured and died in Fort Delaware, I’m unclear on who “Uncle Ollie” is. [2, 3, 4, 5]