Seth Ledyard Phelps (January 13, 1824 – June 24, 1885) was an American naval officer, and in later life, a politician and diplomat. Phelps received his first commission in United States Navy as a midshipman aboard the famous USS Independence. He served patrolling the coast of West Africa guarding against slavers. During the Mexican–American War he served on gunboats, giving support to Winfield Scott's army, and later served in the Mediterranean and Caribbean squadrons.

During the American Civil War Phelps advanced to the rank of lieutenant commander and served with distinction during the Mississippi River campaigns. He was noted for his familiarity of the river systems in the Western theater and conducted several reconnaissance missions, discovering the presence of Confederate Fort Donelson, in Tennessee. He commanded squadrons of gunboats on the Mississippi, Tennessee and Cumberland rivers and played key roles in the riverboat assaults during the various battles in the river campaigns, often supporting Ulysses S. Grant, William T. Sherman and other Generals with their troop deployments on land. For his service Phelps received much praise in various prominent newspapers. As a young commander, Phelps was an outspoken critic of the Navy's method of promotion that favored seniority over military experience and capability. As Phelps served with every flag officer and fleet commander on the Mississippi and Tennessee Rivers during the Civil War, his biography provides an almost continuous account of the naval engagements that occurred in the Trans-Mississippi Theater during that war. In later life Phelps was on the board of commissioners and was its first president, and later, U.S. Minister to Peru.

Early life Seth Phelps was named after his grandfather, who served in the American Revolutionary War and at times with George Washington and was present at Valley Forge. The senior Seth was later promoted to captain and became an aide to General Washington.Slagle, 1996, p. 8 Seth Ledyard's father's name was Alfred Phelps, who served in the War of 1812 under Winfield Scott in the Battle of Queenston Heights in Ontario. After the war Alfred returned home, started a law practice, and then met and married Ann B. Towsley on July 1, 1820. Shortly thereafter Seth was born on January 13, 1824, in Parkman, Ohio, the eldest of five siblings. His two younger brothers Alfred and Edwin soon followed. The Phelps family moved to Chardon, Ohio, and bought a farm just east of Cleveland, a short distance from Lake Erie. Later in life, Seth's father became active in Republican politics in Ohio.Slagle, 1996, p. 392 Seth grew up near the lake and listened along with his brothers to the stories of his father about his seafaring adventures, especially those of Oliver Hazard Perry. These stories are largely what inspired Seth to pursue a career in the navy.Slagle, 1996, pp. 9–12 He married Elizabeth Maynadier (born July 21, 1833, died May 27, 1897), on July 1, 1853, whom he would affectionately refer to as "Lizzie". She was the daughter of Captain Maynadier, of the Ordnance Department, Washington D. C. During his naval service Phelps frequently wrote to her of his life in the military.Phelps family, 1899, vol ii, p. 1076Oakhill Cemetery records

Early naval career

As a boy, inspired by his father's accounts of family history during the American Revolution and the War of 1812, Seth longed to join the Navy. Before going off to join, he bid farewell to his mother, who was apprehensive of his joining the navy, and to his proud father, who whole heartily supported Seth's aspirations, and set off for New York, arriving there in January 1842. Here Phelps saw for the first time many tall clipper ships and warships and was impressed with their huge masts and banners filling the skyline. He was assigned to the USS Independence, launched in 1814, a ship of the line, 190 feet long with 74 guns. At the time of Phelps' commission, the vessel had been converted to a 60-gun frigate.Slagle, 1996, pp. 9–10U.S. Naval Historical Center, 2002

Phelps was anxious to go out to sea, but the Independence remained in port for several months. On May 14, 1842, he finally got his first such orders, boarded the Independence and headed for Boston. Phelps found his first day at sea exhilarating; however, as the sea became rougher, the young Phelps had to deal with sea sickness by stomping on the deck while marching from stem to stern. As a midshipman, his visit to Boston marked the end of his probationary period, at which time his captain would decide if Phelps was fit to continue service, and Phelps was approved. When he learned that the USS Columbus needed midshipmen for its service in the Mediterranean, he wanted to transfer. To get past the six months' required service as midshipman for that position, he wrote to Ohio representative Elisha Whittlesey in Washington, D.C., for a transfer. Upon Whittlesey's recommendation, at age seventeen, Seth's appointment to midshipman was made on October 24, 1841. He transferred to Columbus, a ship of the line, and when his orders arrived he served the next three years with the Mediterranean Squadron, considered the choicest of the several active U.S. squadrons stationed about the globe.Slagle, 1996, pp. 12–13 The Columbus was an old ship that had seen years of duty. When Phelps reported aboard he found the ship's rigging, sails and other fixtures in very poor condition. Before departing from Boston, Phelps and other crew members were given the task of replacing the ship's ropes and sails with new ones. After weeks of repairs, the Columbus finally departed Boston and on August 24, 1842, Phelps was at sea for the first time. While aboard, Midshipmen were required to continue their education, studying mathematics and schooled in the ways of navigation, weapons, along with knot-tying classes, where more than fifty knots, splices, and hitches had to be mastered.Slagle, 1996, pp. 13, 16

After an uneventful voyage, the Columbus's first call was at Gibraltar. Stopping briefly, she then joined the USS Congress and set sail for Port Mahon in the Balearic Islands, where, upon arrival, they joined with the rest of the Mediterranean Squadron.Slagle, 1996, p. 16 That winter, after demonstrating that Phelps was a hard worker he was made Master-Mate of the Main Gun Deck. His promotion was the cause of resentment to a couple of Phelps's shipmates, who sometimes would resort to measures aimed at getting him into trouble, but which never succeeded. Writing to his father, Phelps maintained that there were times when they would attempt to provoke him to a duel, but reassuring his father, he said he abhorred the practice and always managed to avert the situation.

After a foiled smuggling attempt in Havana aboard the Robert Wilson, custody of the ship was given to the Americans. Phelps volunteered to help get the ship back home and was made midshipman. With the former crew under arrest, the ship departed on February 1, 1846, headed for Portsmouth, Virginia. Later he removed to Washington, D.C., where he lived for a brief period.Slagle, 1996, pp. 41–44

In June 1846 Phelps received his long-awaited orders to attend the naval school at Annapolis, Maryland. He was to report aboard the Bonita. In a June 15 letter to his father, he expressed his regrets that he could not visit with family, who were only 30 miles away D.C.Slagle, 1996, pp. 44–45

Mexican war Phelps served aboard the Bonita and Jamestown during the Mexican–American War, giving naval support to Winfield Scott's Army during the Siege of Veracruz. Much of his time was also spent patrolling the Mexican coast on blockade duty. In little time Phelps had already developed strong opinions about how the war should be conducted, and was displeased that the Navy was lending much of their service protecting merchant ships while sailors were coming down with scurvy for want of provisions.Slagle, 1996, pp. 45–47, -

In 1857, after ten years of shore duty, Phelps was assigned to the USS Susquehanna, a side-wheel man-of-war and returned to serving at sea in the Mediterranean Squadron.Slagle, 1996, p. 81

Service in the Civil War Seth L. Phelps played a major role in the many naval operations in the Western Theater of the Civil War, and commanded various gunboats that were part of the Mississippi River Squadron which were active on the Mississippi, Ohio, Tennessee and Cumberland Rivers. Created on May 16, 1861, it was controlled by the Union Army until September 30, 1862. John Rodgers was the first commander of the squadron and was responsible for the construction and organization of the fleet. He obtained the service of three experienced men, Phelps, Strembel and Bishop to assist him with the huge task of converting riverboats into gunboats.Joiner, 2007, p. 23 Admiral Foote encouraged Major General Henry W. Halleck and General Ulysses S. Grant, to move against key positions held by the Confederates on the several rivers that controlled vital river access to the south. During this time Phelps worked closely with Admiral Foote and General Grant in the various battles that opened up the South to the Union Army and Navy. When Foote assumed command of the squadron it consisted of three timberclad (wooden) vessels, that had been converted to gun-boats by Commander Rodgers, nine iron-clad gun-boats and thirty-eight mortar-boats, some of which were still being built.Hoppin, 1874, p.157-159Slagle, 1996, pp. 151–158

When the Civil War broke out in 1861, Phelps was a lieutenant and was given command of a small fleet of three vessels: The USS Conestoga, USS Tyler and USS Lexington. Before their commissioning he was disappointed to find the ships in dire need of repairs and that they were grounded in shallow water on the Ohio River. None of the vessels had any armament aboard yet and were in need of other equipment. Phelps had to board the Conerstoga, the smallest of the three vessels, through a gun-port, as there was no gangplank available at the time. He was greeted by Captain S. L. Shirley, who was the president of the Louisville & Cincinnati Mail Boat Line. On June 30 Phelps hired three dredge boats and attempted to clear a deep enough passage to free up the vessels, but during the summer months the Ohio River became increasingly shallow, preventing the operations to free the vessels. In the meantime Phelps wrote to Commander John Rodgers of the situation. Rodgers was working with General Grant to coordinate naval operations with those of the Union Army in the Western theater.Cooling, 2003, p. 19 In the meantime, having to wait several weeks for the river to rise, Phelps proceeded with repairs and the conversion of the vessels into gunboats.Slagle, 1996, pp. 117–118 After repeated efforts to get the vessels down river, Rodgers arrived at Cairo, Illinois, where the vessels underwent further fitting out.Gott, 2003, p. 25 He had managed to enlist three naval lieutenants to command the individual vessels along with some 1000 fishermen from the east coast, but was still short of the manpower needed to effectively use the vessels in combat.Pratt, 1956, p. 19 Phelps was finally given command of the converted gunboats, with orders to proceed to Fort Henry, under the command of Brig. Gen. Lloyd Tilghman, on the Tennessee River and assist General Ulysses S. Grant in the eventual siege and capture of two riverfront forts he proved instrumental in the ensuing Union victory at the Battle of Fort Henry and Battle of Fort Donelson during the spring of 1862.Slagle, 1996, pp. 122–124 Having much experience navigating and scouting the Ohio, Tennessee and Cumberland rivers, Phelps was considered the most knowledgeable about running gunboats along these rivers.Knight, 2011, p. 84

Foote relieves Rodgers