09/01/2026
On this day in 1862, the U.S. Navy gunboat USS Uncas saw its first combat action of the Civil War.
Operating along Florida’s St. Johns River, Uncas, joined by Patroon, engaged Confederate forces at St. Johns and Yellow Bluffs. The clash was part of the continuing struggle for control of the waterways of the South, where rivers could serve as highways for troops, supplies, intelligence, and naval power.
The September 1 action was only the beginning. Days later, Uncas and Patroon would face Confederate batteries at St. Johns Bluff in a much larger engagement lasting more than four hours.
Civil War naval history wasn’t confined to famous battles on the open sea. Gunboats like Uncas carried the war into rivers, sounds, and narrow coastal waterways—places where control of the water could shape everything happening on land.
At the National Civil War Naval Museum, we preserve and share the stories of the ships, sailors, and waterways that helped shape the Civil War.
Come aboard and discover more.