Materials relating to the American Civil War and the men who fought in it, chiefly of the Union Army.

Correspondence, manuscripts, documents, and newspapers. These include over four hundred letters to Alexander, as well as miscellaneous letters and telegrams; some of his manuscripts and notes; business records of his law firm; military documents of the western divisions of the Confederate Army; copybooks and letter books; and complete and partial newspapers and clippings from the various Southern newspapers (in particular THE SAVANNAH REPUBLICAN, the DAILY DISPATCH of Richmond, and the ADVERTISER AND REGISTER of Mobile) which carried Alexander's dispatches.

A group of documents belonging to Confederate General P. G. T. Beauregard, which were captured by Lieutenant Colonel Robert P. York of the 75th New York Volunteers in the spring of 1865. The collection also contains letters and documents by and about York.