In April 1861, Fort Sumpter in Charleston Harbor was attacked, starting the Civil War. At that time, the United States Army consisted of 16,000 troops, most posted in small forts west of the Mississippi River.

In April 1861, Fort Sumpter in Charleston Harbor was attacked, starting the Civil War. At that time, the United States Army consisted of 16,000 troops, most posted in small forts west of the Mississippi River.
