Walter S. Clarke: 7th Battalion Field Artillery or Private Clarke to Corporal. Material: paper. Size: 9 1/2" x 14". Description: white military promotion form certifying that Private Walter S. Clarke is promoted to the rank of Corporal; signed at Fort Snelling, Minnesota on April 1, 1905 by Nathan Shelton, Commanding Officer of the Artillery Corps and S. E. Allen, Major Artillery Corps.