The James Forsyth papers (61 items) contain 47 letters and documents, primarily from Forsyth's colleagues in the military; 1 copy of a diary and 2 eye-witness accounts of military engagements; and 6 printed items and ephemera.
Eight letters relate to the Civil War, including an important series of items between Forsyth and Sheridan. Twenty-one items date from after the war (1866-1868) and provide information about Washington and military politics, including letters from Sheridan and George Armstrong Custer. Twelve letters were written while Forsyth accompanied Sheridan to Europe as an aide-de-camp, including a telegraph from Otto von Bismarck, which is a brief telegram in German to Sheridan.
The Diary and Personal Accounts series contains material from Europe including an incomplete eyewitness account of the Battle of Sedan (September 1, 1870); an incomplete account of the surrender of Napoleon III after the Battle of Sedan (recounting September 2, 1870, but written in 1881); and a 68-page diary of his observation of the Franco-Prussian War from German lines, including the Battle of Sedan in 1870.
The Printed items include a West Point Roll of the Cadets for the year 1846, lists of Fourth Class members in 1846 and 1852, and an Official Army Register for September 1861. Ephemera include an official bridge and ferry pass (1864), Forsyth's 1870 passport, and a complementary Union Pacific Railroad pass to board a special train bringing the Grand Duke Alexis of Russia and party from Omaha to McPherson Station in Nebraska, for a "Grand Buffalo Hunt," under direction of Lieutenant General P. H. Sheridan.