The Battle of Secessionville (First Battle of James Island) on June 16, 1862, was the defeat of the only Union attempt to capture Charleston, South Carolina, by land during the American Civil War.

In early June 1862, Maj. Gen. David Hunter transported the Union divisions of Brig. Gens. Horatio G. Wright and Isaac I. Stevens, under the immediate direction of Brig. Gen. Henry Benham, to James Island, where they entrenched at Grimball's Landing near the southern flank of the Confederate defenses. Benham landed 6,500 men from the 3rd New Hampshire, 8th Michigan, 7th Connecticut, 28th Massachusetts, and 79th New York "Highlanders" on the southeastern end of James Island, and marched toward Charleston. However, Brig. Gen. Nathan "Shanks" Evans, who commanded less than half that number of Confederate forces, made up of troops from South Carolina, North Carolina, and Georgia, met the Northern troops at a fort at Secessionville commanded by Colonel T. G. Lamar and routed them.

The Union suffered 683 casualties (107 dead), compared to 204 (52 dead) by the Confederates. Although the battle was minor, it served as a powerful propaganda victory, increasing morale particularly in Charleston and offsetting recent Confederate losses in the Western Theater.

Benham had acted against orders in attempting to take James Island, and he was subject to a court martial after the loss. Although the numbers involved were small, the stakes were high. The Union would continue to attempt to starve and attack Charleston for the rest of the war, and, had they succeeded, the "Fort Lamar" at Secessionville (which had been named not for the secession of South Carolina, but for an earlier attempt of some plantation owners to rebel) would have controlled the harbor.

Battle of James Island
Part of the American Civil War
Date June 16, 1862
Result Confederate victory
Belligerents
United States United States (Union) Confederate States of America CSA (Confederacy)
Commanders and leaders
Henry Benham Nathan Evans
Strength
6,600 2,000
Casualties and losses
685 204