By his early twenties, Smalls had developed a reputation significant enough that in the fall of 1861, he was assigned to the CSS Planter, a 147-foot sidewheel steamer that had been built in Charleston in 1860 and was now under the command of Captain Charles C. J. Relyea, serving as an armed transport and dispatch vessel for Confederate Brigadier General Roswell Ripley’s department.
The ship was not a warship in the traditional sense. It was a working vessel — shallow-drafted, maneuverable, suited to the shallow inshore waters around Charleston. Its length was roughly that of two city lots end to end. It carried one long 32-pounder gun and one short 24-pounder howitzer. What made it useful to the Confederates was exactly what made it navigable by someone who knew these waters: it could go where larger, deeper vessels could not, and it could move quickly between the various defensive installations around the harbor.
Smalls worked aboard the Planter as its wheelman. He was enslaved. He was not paid beyond whatever small arrangement existed. He steered the vessel, he learned its mechanical temperament, and he watched everything.
He learned the signals.
This is the detail that made the escape possible. Each Confederate harbor installation had a specific steam-whistle signal that approaching vessels were expected to give. A passing vessel that gave the correct signal was acknowledged and allowed through. One that did not would be challenged and potentially fired upon. The signals changed, but those who worked regularly on the harbor’s vessels — as Smalls did — knew what the current signals were. He paid attention. He remembered. He understood that this knowledge, held in his memory, was not merely professional information. It was a potential key.