The Underground Railroad Conductor Who Led a Civil War Assault
Harriet Tubman is best known for guiding enslaved people to freedom, but in June 1863 she made military history. Working as a Union scout and spy, Tubman planned and guided the Combahee Ferry Raid in South Carolina. Leading three gunboats upriver past Confederate torpedoes, she became the first woman to lead an armed assault in U.S. history. The raid crippled local plantations and freed more than 700 enslaved people in a single night.
From Underground Conductor to Military Operative
Harriet Tubman's reputation as the most daring conductor on the Underground Railroad often overshadows the pivotal role she played in the American Civil War. By the time the war erupted in 1861, Tubman had spent over a decade repeatedly infiltrating the American South, guiding dozens of enslaved people to freedom through sheer operational discipline, woodcraft, and an intimate understanding of safe routes. When the Union Army captured the Sea Islands of South Carolina in late 1861, military authorities realized that holding the coastal South required specialized local intelligence and unconventional warfare skills.
In 1862, with the support of Massachusetts Governor John Andrew and Union military officials, Tubman traveled to Beaufort, South Carolina. The coastal region was occupied by federal forces but surrounded by hostile Confederate territory, where expansive rice and cotton plantations operated along winding tidal rivers. Tubman initially served as a nurse, cook, and humanitarian liaison, treating wounded soldiers and dysentery-stricken refugees with herbal remedies she had learned in Maryland. However, her true value to the Department of the South quickly shifted toward scouting, reconnaissance, and military intelligence.
Mapping the Lowcountry and Gathering Intelligence
Operating effectively in the Lowcountry of South Carolina was a logistical nightmare for Union commanders. The waterways were notoriously shallow, tides fluctuated dramatically, and Confederate forces had placed underwater mines—then called torpedoes—across critical shipping channels. White Union officers had little success extracting actionable intelligence from local populations who were understandably distrustful of unfamiliar soldiers. Tubman, however, moved among the newly liberated Gullah communities with natural credibility and authority.
Tubman organized a clandestine network of scouts and informants who mapped the Combahee River. Her operatives traveled behind enemy lines to document Confederate picket stations, troop strengths, artillery placements, and the exact locations of underwater torpedoes laid beneath the river surface. Because she understood how plantation networks communicated, she was able to synthesize granular navigational and tactical data that Union naval officers could not obtain on their own. By the spring of 1863, Tubman presented federal command with a comprehensive tactical plan for a deep, motorized raid along the Combahee.
The Architecture of the River Raid
The military plan aimed directly at the economic engine sustaining the Confederate war effort in the region: the wealthy rice plantations along the Combahee River. Beyond crippling the Confederate supply line, the raid aimed to liberate hundreds of enslaved laborers and recruit able-bodied men directly into the Union Army. Union Major General David Hunter authorized the expedition, partnering Tubman with Colonel James Montgomery, an ardent abolitionist who commanded the 2nd South Carolina Volunteer Infantry, an African-descended regiment.
On the night of June 2, 1863, three federal steam gunboats—the USS John Adams, the USS Harriet A. Weed, and the USS Sentinel—departed Beaufort and steamed toward the mouth of the Combahee. The Sentinel ran aground early in the mission, but the remaining two vessels pushed forward into the dark, guided directly by Tubman and her scouts. Relying on Tubman's intelligence, the gunboat captains maneuvered past submerged Confederate explosive devices without detonating a single mine.
The Strike on the Combahee
In the early morning hours of June 3, the gunboats reached predetermined plantation landings, including the ferry crossing and key wharves. Union landing parties deployed rapidly, setting fire to rice mills, storehouses, bridges, and plantation mansions while destroying valuable agricultural machinery and thousands of barrels of rice destined for Confederate troops. The gunboats sounded their steam whistles, signaling across miles of fields that federal forces had arrived to deliver liberation.
What followed was an extraordinary mass exodus. Hundreds of enslaved men, women, and children abandoned the fields and quarters, sprinting toward the riverbanks amid the confusion of Confederate overseers and militia units who attempted, but failed, to mount an effective defense. Tubman described the chaotic scene on the riverbank, where terrified refugees crowded the gunboat rowboats, clutching small children, chickens, and household goods. When panic threatened to overturn the evacuation boats, Tubman sang verses of spirituals to calm the crowds, restoring order so the evacuation could proceed safely.
Tactical Devastation and Enlistment
The Combahee Ferry Raid was an unmitigated military success. In less than twenty-four hours, the expedition destroyed millions of dollars worth of Confederate infrastructure and commodities without losing a single Union soldier. The raid shattered the Confederate home front in coastal South Carolina, proving that the Union could penetrate deep into the southern interior using combined naval and infantry tactics guided by guerrilla intelligence.
More than 700 enslaved people—estimates generally range from 727 to over 750—were liberated during the operation and transported back to Union-held Beaufort. The raid also served as an immediate boon to Union military strength. Within days of landing at Beaufort, well over one hundred of the newly freed men enlisted in the 2nd South Carolina Volunteer Infantry, trading bondage for federal uniforms and rifles to fight against the Confederacy.
Erasure, Recognition, and Historical Legacy
The Combahee Ferry Raid marked the first time in United States history that a woman planned and guided an armed military assault. Contemporary northern newspapers, including the Commonwealth of Boston, praised the raid's execution and noted the leadership of the Black woman who orchestrated it, though they initially withheld her name for security reasons. Despite her extraordinary wartime service as a scout, spy, and nurse, the United States government spent decades refusing Tubman's petitions for a military scout's pension, eventually granting her only a modest widow's pension based on the service of her late husband, Nelson Davis.
Modern historical scholarship has reevaluated Tubman not merely as an icon of humanitarian rescue, but as an astute military strategist whose mastery of geography, psychology, and irregular warfare outmaneuvered Confederate forces. The Combahee River expedition demonstrated that the abolition of slavery and the military defeat of the Confederacy were deeply intertwined, powered from the inside out by the very people who had been held in chains.
Key takeaways
•Harriet Tubman became the first woman in U.S. history to plan and guide an armed military assault during the June 1863 Combahee Ferry Raid.
•Relying on a network of Black scouts and informants, Tubman mapped Confederate troop positions and navigated Union gunboats past submerged river torpedoes.
•The raid destroyed vital Confederate plantations, mills, and food stores while liberating more than 700 enslaved people without a single Union casualty.
•Over one hundred of the men freed during the raid immediately enlisted in the Union Army, directly converting liberated labor into federal military power.