Cosam T. Bartlett (b. 1837), a son of William K. Bartlett of Warsaw, New York, served in the 9th New York Cavalry Regiment during the first year of the Civil War, and left for the Navy in 1862. He served on the gunboat Daylight . After the war, he moved to Attica, New York, with his wife Hettie and worked as a lawyer. His brothers, William M. and York, also served in the military during the Civil War.
From the guide to the Cosam T. and William Bartlett family papers, Bartlett, Cosam T. and William family papers, 1861-1863, (William L. Clements Library, University of Michigan)