Handwritten and signed letter and diary. This letter is addressed to Captain Edward L. Hartz and is dated April 17, 1856. It discusses a military march through the Rio Grande Valley and life in and around Fort Union, New Mexico. The diary, kept from 1855-1856, records Irwin's journey from New York to Corpus Christi, Texas, abroad the steamship Prometheus and his overland march to Fort Filmore via a number of military forts.; Biographical History
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