After combing the Registry of Trials by General Court Martial 1881-1882, I concluded that the culprit was not in the NARA index there. In searching the Wyoming State archives for mentions of Cavanaugh and various spellings of the names, I hit paydirt. The Cheyenne Weekley Leader on Oct. 6, 1881, published an account. “The shackled private who passed south from this city Sunday [Oct 2] and excited considerable curiosity,…
Great investigative work!