In the last year of the Civil War, the Union forces took advantage of their seapower to carry the conflict to sections of Florida that had heretofore escaped the ravages of war. Operating from bases which they had seized along the Gulf and Atlantic coasts of the state, Union columns would strike deep into the interior and fall back before the Confederates could rally a force strong enough to intervene. Raiding parties were likewise put ashore from transports. If they ran into serious opposition, the raiders would fall back to the beach, where they would be covered by the great guns mounted on the supporting warships.
Bearss, Edwin C.
"Federal Expedition Against Saint Marks Ends At Natural Bridge,"
Florida Historical Quarterly: Vol. 45
, Article 5.
Available at: https://stars.library.ucf.edu/fhq/vol45/iss4/5