After recovering from injuries sustained while battling Comanches in Texas in 1859, Maj. Gen. W.B. Hazen commanded a brigade in the Army of the Ohio and was instrumental to the Union victory at the Battle of Shiloh. His troops were also successful at Chattanooga and during the Atlanta Campaign. After the war, President Hayes appointed Hazen chief signal officer, a position he held until his death in 1887.
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