This collection consists of a single letter from Henry T. Bartlett, formerly a bugler in companies H and F, 1st Massachusetts during the American Civil War, written in 1888 to Samuel E. Chamberlain, of Wether[s]field, Connecticut, president of the Cavalry Corps, Society of the Army of the Potomac (S.A.P.). Writing as vice-president of the S.A.P. Cavalry Corps, Bartlett urges Chamberlain to nominate a cavalryman as the next S.A.P. president at the upcoming S.A.P. meeting and describes the role of the cavalry at the Battle of Gettysburg. Bartlett mentions having failed to interest General Henry Eugene Davies in the nomination and suggests General Pleasanton. The letter is written on the stationery of MacAlister and Bartlett, New York lumber dealers.