USS Cairo

USS Cairo was one of seven City-class ironclads built by James B. Eads at his shipyard in Carondelet, Missouri, under a contract with the Union Army. Designed by naval architect Samuel M. Pook, these vessels were shallow-draft, casemate ironclads intended for riverine operations. Cairo was launched in October 1861 and commissioned in January 1862, armed with 13 guns including 42-pounder rifled cannons and 8-inch smoothbores. Her armor consisted of 2.5 inches of iron plate over a wooden hull, and she was powered by two steam engines driving a central paddlewheel. The City-class design proved effective for navigating the Mississippi and its tributaries, though their low freeboard made them vulnerable to plunging fire and mines.

Cairo participated in several key operations in the Western Theater, including the capture of Fort Henry and the bombardment of Fort Pillow. She was part of Flag Officer David Farragut's fleet during the Battle of Memphis in June 1862, where she helped destroy the Confederate river fleet. Later that year, she supported Union operations along the Mississippi and Yazoo rivers, engaging Confederate batteries and escorting troop transports. Her most notable action came in December 1862 during the campaign against Vicksburg, when she was assigned to clear torpedoes from the Yazoo River. On December 12, 1862, while sweeping the river near Haines Bluff, Cairo struck a Confederate electrically detonated mine, which caused her to sink in about 12 minutes. All of her crew survived, but the ship was lost.

The sinking of USS Cairo was a significant event, as it demonstrated the effectiveness of torpedo warfare against ironclads. The Confederate mine was triggered by an electrical cable from the shore, a relatively new technology at the time. The wreck lay undisturbed in the Yazoo River for over a century, gradually being buried by silt. In 1956, a team led by historian Edwin C. Bearss located the wreck using sonar and magnetic detection. In 1964, the U.S. Army Corps of Engineers raised the hull, which was remarkably well-preserved due to the mud that had sealed it. The salvaged artifacts, including weapons, personal items, and machinery, were conserved and are now displayed at the USS Cairo Museum at Vicksburg National Military Park. The ship itself is a National Historic Landmark.

One of the lesser-known facts about USS Cairo is that she was originally built for the U.S. Army, not the Navy, as the Army was responsible for riverine operations early in the war. Her crew included African-American contrabands who served as laborers and pilots. The wreck's recovery yielded a rare collection of Civil War-era artifacts, including a complete set of the crew's personal effects, such as pipes, combs, and a chess set. The conservation process took decades, and some artifacts are still being treated. Cairo's sinking also influenced naval tactics, leading to increased use of minesweeping and the development of more robust hull designs. The ship's bell, recovered in 1964, is now on display at the museum and is rung annually on December 12 to commemorate the sinking.

Casemate ironclad

A type of ironclad warship with armored sides and a sloped armored roof, carrying guns in a central battery.

Torpedo

In Civil War usage, a stationary explosive device, now known as a naval mine.

City-class

A class of seven ironclad gunboats built for the Union Army, designed by Samuel M. Pook.