St. John's Bluff

From October 1 to 3, 1862, Union and Confederate troops clashed in Duval County, Florida, in an engagement remembered as the Battle of St. John's Bluff. The clash unfolded during the American Civil War and ended in a decisive win for Union forces, a result that strengthened their grip on the Jacksonville region.

History

Control of the St. Johns River mattered greatly to Federal plans for subduing Florida. Holding the waterway would let Union forces strike Confederate outposts further inland while also serving as a dividing line for dominance over the eastern part of the state. Beyond military goals, Federal leaders envisioned North Florida as a refuge for slaves who had escaped bondage and as a starting point for Reconstruction efforts within the state. Jacksonville, Florida fell under Federal occupation as early as March 1862, and gunboats based at Mayport Mills patrolled the river's length.

To choke off the advance of Union naval vessels along the St. Johns, Confederate Brigadier General Joseph Finnegan had established an artillery position on St. Johns Bluff, situated on the river's southern bank some 18 miles below Jacksonville, Florida, early in the conflict. Confederate defeats at Fort Donelson and Fort Henry pulled Florida's Confederate manpower away to Tennessee, leaving Finnegan with scant resources to work with. Despite this, he succeeded in fortifying the bluff, relying on enslaved laborers to build up the defenses under military direction. These fortifications formed one piece of a broader Confederate defensive network that also included positions near Fort Caroline and Yellow Bluff Fort.

Fighting began on September 11, when Confederate gunners fired upon the approaching USS Uncas. The USS Patroon soon joined its sister vessel in bombarding the bluff, though neither ship managed to silence the Confederate guns. Anticipating a difficult fight, Union commanders sent more than 800 troops from South Carolina to seize the position, and these reinforcements reached Mayport Mills on October 1. Brigadier General John Milton Brannan, who commanded the Union expedition, later described how, on that first day, gunboats probing the river had come under heavy fire from the batteries at Saint John's Bluff and had been forced to pull back. The 47th Pennsylvania Infantry Regiment took part in this operation, coming ashore along Buckhorn Creek at seven in the morning on October 1 before advancing toward what Colonel Tilghman H. Good, its commander, called "Parker's plantation."

By the following day, Brannan's men had swung around to approach the bluff from behind. In his own account of October 2, Brannan noted that a scouting detachment from the 47th Pennsylvania, led by Captain Keck, had caught a rebel encampment by surprise, capturing camp equipment along with roughly sixty firearms of various kinds, mostly rifles, though the Confederates themselves managed to flee thanks to their horses and the difficult terrain.

Confederate Colonel Charles F. Hopkins is said to have grown alarmed as Union troops closed in from behind while gunboats continued shelling the bluff from the river, even though Captain Winston Stephens felt confident the position could withstand the Federal attack. Hopkins nonetheless ordered a withdrawal on October 2 and 3, allowing Union forces to take over the abandoned Confederate works and capture the artillery pieces left behind. Two days afterward, on October 5, Federal troops pressed on to Yellow Bluff Fort nearby, where the retreating Confederates had also taken shelter.

Aftermath

Federal forces moved back into Jacksonville on October 3, following their triumph at St. Johns Bluff. Finnegan regarded Hopkins' withdrawal from the bluff as a "gross military blunder," though Hopkins continued to justify his decision to pull back. With this outcome, Confederate forces in North Florida could no longer block Union control of the St. Johns River and Jacksonville.