This diary covers from August 13, 1862-November 4, 1863, Fulton's entire term of service in the army. The entries are anywhere from 2-20 lines long and note some of his activities in the cavalry and fastidiously document his incoming and outgoing personal correspondence. He wrote primarily to his mother, his brother William, and his cousin George. Though he apparently did not participate in any large-scale battles, he noted a skirmish with Stuart's cavalry on their way to Williamsport on September 20, 1862. He described escorting supply wagons and was often called to stand guard. He spent much of his time near Washington, and in Clarksville and Nashville; he mentioned General Rosecrans several times.
Near the end of the volume, after a gap of approximately 100 blank pages, are several interesting entries including cholera and cough remedies, a list of personal receipts, several records of goods received, and a number of drawings and specifications for "Fulton and Praeger's Improved Siphons," with information on improving plumbing and siphon heads. The back of the diary is marked St. Louis, August 11, 1865.