FRIDAY, JULY 12, 1861.
A pleasant cool day and apparently much enjoyed by all. A great many soldiers moveing, some just coming into the City, some going into camp back of the City, and some marching for Virginia. The Union Regt Col Slocum, Ny Y [sic] 27th Regt Volunteers, came in last night and occupy the camp on Franklin Square. The Lyons Co, Capt A D Adams, is along; the men all look well. Went with Julia to the RI Camp. It was the finest drill and parade I ever saw. Secy of War was there. There were two Regts or about 2200 men.
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The three diary manuscript volumes, Washington during the Civil War: The Diary of Horatio Nelson Taft, 1861-1865, are available online at The Library of Congress.