Silas Stillman Soule (1838-1865) was a Maine-born abolitionist whose family joined the New England Emigrant Aid Society in settling Kansas as a free state, where he became active in the Underground Railroad and Free-State militias. After moving to Colorado in 1860, he was commissioned in the First Colorado Infantry in 1861, served in the Battle of Glorieta Pass, and later held various roles within the reorganized First Colorado Cavalry, eventually being promoted to captain of Company D at Fort Lyon in 1864. On November 29, 1864, Soule expressed opposition to and refused to participate in the Sand Creek Massacre. He was appointed Denver's Provost Marshal in early 1865 and testified against Colonel John Chivington during the February 1865 Army inquiry. Soule married Hersa Coberly (1845-1879) on April 1, 1865, and was killed by Charles Squier in Denver on April 23, 1865, likely in retaliation for his testimony.
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