As a colonel, Crocker led a brigade of the 11th, 13th, 15th, and 16th Iowa Infantry at the fall 1862 battles of Iuka, top, and the Second Battle of Corinth, above. The engagements were part of a multi-theater offensive launched that fall by the Confederacy that was turned back at the battles of Antietam, Perryville, and the aforementioned fights in Mississippi. The South would never again be able to mount such coordinated campaigns. (Niday Picture Archive/Alamy Stock Photo)
Niday Picture Archive/Alamy Stock Photo