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  Then followed one of equal importance to me altho' of no official interest to you.   By Par. 6 of S. O. No. 6. A.G.O. January 8, 1870, I was assigned to duty at the Massachusetts Agricultural College at this place as Professor of Military Science and Tactics, and General Sherman kindly dated this assignment back to take effect September 10, 1869, the day I came here and began work.