TLS, one page, 6 x 7, American Expeditionary Forces letterhead, June 6, 1919. Letter to Lieutenant Colonel A. Trowbridge. In part: “As activities of our army in France are drawing to a close, I desire to express my appreciation of your loyal and energetic work in the American Expeditionary Forces. You were among the first officers to arrive in France and you promptly took up your duties as Assistant to the Chief, G-2-C, G. H. Q. Your services in the study of problems connected with Flahs [sic] and Sound ranging, in the training of ranging troops, and in the supervision of ranging sections at the front…contributed most materially to the successful operation of the ranging service…It was indeed fortunate that the American Army could so advantageously employ your well known technical ability and experience.” Double-matted and framed with two photos, an AEF pin, and the original mailing envelope to an overall size of 19.5 x 15.5. In fine condition, with slightly trimmed edges. Sound ranging is a method of determining the coordinates of a hostile artillery battery using data derived from the sound of its guns firing. Colonel Augustus Trowbridge would receive the Army Distinguished Service Medal for his work in training troops in this technique. Pre-certified PSA/DNA and RR Auction COA.
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