<https://www.historynet.com/shermans-secret-weapon-was-his-map-maven/acwp-191100-merrill-01/#primaryimage>
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"Lt. Col. William Merrill, standing at left of table with his left hand on the map, and his fellow Army of the Cumberland “draughtsmen,” photographed by Mathew Brady late in the war. (Mathew Brady/War Department/National Archives)"
<https://www.historynet.com/shermans-secret-weapon-was-his-map-maven/acwp-191100-merrill-01/>