92 leaves of forms printed both sides, 67 leaves completed in ink manuscript, 14¼x9¾, original calf and marbled boards with printed paper label on front cover.

Continuous sequence of guard reports dated 20th Dec. (1862)-10th June, 1863. Each page with printed head "Report of a Guard Mounted at" followed by subheadings :Articles in Charge"; "List of the Guard" and List of Prisoners." A brief summary by the Officer of the Day at bottom of each report. Reports completed in ink by a variety of hands. Camp locations are not given in the handwritten text, but the 1st Massachusetts was at the Battle of Fredericksburg (Dec. 12-15, 1862) and the Gettysburg Campaign beginning June 11, 1863 - dates which bracket these reports.