Shortly after President Champlin closed the college in the ensuing excitement after the news of the firing on Fort Sumpter in 1861, Shannon enlisted in Company “H” of the 5th Maine Regiment , Volunteer Infantry. He was made an aide-de-camp for General Slocum in March 1862 and was taken prisoner at Chancellorsville in May 1863. Shannon spent 18 days in Libby Prison in Richmond and recorded his diary entries on blank leaves of a book (Grecian and Roman Antiquities, Robsn DE59.B685 E5 1848)) that he purchased while a prisoner. He was honorably discharged in 1866 and received the brevets of Major and Lieutenant Colonel in 1867.
Text from http://www.colby.edu/specialcollections/about/richard-cutts-shannon-colby-1862/ Transcriptions may be found at http://web.colby.edu/csc-home/shannon/
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Richard Cutts Shannon, Civil War diary, Volume 2a (September 1863-January 1865)
Richard Cutts Shannon