David Dixon Porter (June 8, 1813 – February 13, 1891) was a member of one of the most distinguished families in the history of the United States Navy. When he was 10 years old, his father, Commodore David Porter, took David Dixon aboard his ship, frigate John Adams, for a cruise and ordered his officers to submit his son to the discipline of a midshipman. For the remainder of his life, he was associated with the sea.

He served in the Mexican War in the attack on the fort at Vera Cruz. At the outbreak of the Civil War, he formulated and participated in a plan to hold Fort Pickens, near Penacola, Florida, for the Union; its execution disrupted the simultaneous effort to relieve the garrison at Fort Sumter, in the harbor at Charleston, South Carolina, and hence led to the fall of that fort. He commanded a somewhat independent flotilla of mortar boats at the capture of New Orleans. Later, he was advanced to the rank of (acting) rear admiral in command of the Mississippi River Squadron, which cooperated with the army under Major General Ulysses S. Grant in the Vicksburg campaign. After the successful conclusion of that operation, he led the naval forces in the Red River campaign that almost ended disastrously. Late in 1864, he was transferred from the interior to the Atlantic coast, where he led the navy in the joint assaults on Fort Fisher, the final significant naval action of the war. With the return of peace, he became active in the effort to render the US Navy respectable in comparison with the best of the world's navies. He was appointed superintendent of the Naval Academy when it was restored to Annapolis, and there he instituted reforms in the curriculum to instill principles of professionalism. In the early days of the administration of President Grant, he was de facto secretary of the navy. When David G. Farragut was advanced from rank of vice-admiral to admiral, Porter took his previous position; likewise, when Farragut retired, Porter became the second man to hold the rank of admiral. He gathered about himself a corps of like-minded officers devoted to naval reform. Porter's administration of the Navy Department aroused opposition in Congress, and soon Secretary of the Navy Adolph E. Borie was forced to resign. His replacement, George Robeson, curtailed his power and eased him into semi-retirement. He died on February 13, 1891.

David Dixon Porter was born in Chester, Pennsylvania, on June 8, 1813, a son of David Porter and Evalina Anderson Porter. The family had strong naval traditions; the elder Porter's father, also named David, had been captain of a Massachusetts vessel in the American Revolutionary War, as had his uncle Samuel. Both the second David Porter, David Dixon's father, and his brother John entered the fledgling United States Navy and served with distinction during the War of 1812. David eventually rose to the rank of captain, the highest rank awarded in the US Navy prior to the Civil War. Following the war, he was given increased responsibilities and gained the courtesy title of Commodore. David and Evalina Porter had 10 children, including six boys. The youngest, Thomas, died of yellow fever at the age of ten. The other five all became officers, four in the US Navy (William, David Dixon, Hambleton, and Henry Ogden), and one, Theodoric, in the US Army. Hambleton died at sea of yellow fever while yet a passed midshipman. Theodoric was killed at Matamoros in the Mexican War; David Dixon later named his second son Theodoric in memory of his brother. John Porter was not so prolific, but one of his sons, Fitz John Porter, was a major general in the US Army at the time of the Civil War, and a second, Bolton Porter, was lost with his ship USS Levant. Their sister Anne, who married her cousin Alexander Porter, provided a son, David Henry Porter, who was killed while captain of a Mexican ship during that nation's struggle for independence from Spain.

The tradition continued into later generations. David Dixon married George Ann ("Georgy") Patterson, daughter of Commodore Daniel T. Patterson. Of their four sons, three had military careers. Major David Essex Porter served in the army during the Civil War, but resigned after two years in the peacetime army. Captain Theodoric Porter made his career in the navy. Lieutenant Colonel Carlile Patterson Porter was an officer in the US Marine Corps; his son, David Dixon Porter II, also served in the Marines, rising to the rank of major general and earning the Medal of Honor. One of their two surviving daughters, Elizabeth, was married to Rear Admiral Leavitt Curtis Logan.

Commodore Porter also had an adoptive son who later was closely associated with the career of David Dixon. In the early years of the nineteenth century, the commodore was stationed at New Orleans, and his father accompanied the family there in his declining years. There, the older David Porter met and became friends with another former naval participant in the Revolution, George Farragut. In late spring 1808, David Porter Sr. suffered sunstroke, and Farragut took him into his home, where Elizabeth Farragut cared for him. She could not restore him to health, however (he was already weakened by tuberculosis), and he died on June 22, 1808. Perhaps ironically, Elizabeth Farragut died of yellow fever on the same day. Now motherless, the Farragut children were scattered around into the homes of friends and relatives. While he was visiting the family a short time later to express appreciation for the kindness they had shown his father and sympathy for the loss of their wife and mother, Commodore Porter offered to take eight year old James Glasgow Farragut into his own household. Young James readily agreed. Next year, he moved with Porter to Washington, where he met Secretary of the Navy Paul Hamilton and expressed his wish for a midshipman's appointment. Hamilton promised that the appointment would be made as soon as he reached the age of ten; as it happened, the commission came through on December 17, 1810, six months before the boy reached his tenth birthday. When James went to sea soon after with his adoptive father, he changed his name from James to David, and it is as David Glasgow Farragut that he is remembered.

Commodore David Porter was reprimanded by the navy for an 1824 incident that humiliated an official of the Spanish government in Cuba. Although the punishment was minimal, he decided to resign from the navy rather than submit, and he then accepted an offer from the government of Mexico to become their General of Marine – in effect, the commander of their entire navy. Among the several US citizens whom he took along to his new position were a nephew, David Henry Porter, and two sons, David Dixon and Thomas. The two boys were made midshipmen. Unfortunately, Thomas died of yellow fever soon after arriving in Mexico; he was ten years of age. David Dixon, age 12, was not affected by the disease. He was able to serve on the frigate Libertad, where he saw little action, and on the captured merchantman Esmeralda for a raid on Spanish shipping in Cuban waters.

In 1828, he was able to accompany his cousin, David Henry Porter, captain of the brig Guerrero, in another raid. Guerrero, mounting 22 guns, was one of the finest vessels in the small Mexican Navy. Off the coast of Cuba on February 10, 1828, she encountered a flotilla of about fifty schooners, convoyed by Spanish brigs Marte and Amalia. Captain Porter elected to attack, and soon forced the flotilla to seek refuge in the harbor at Mariel, 30 miles (48 km) west of Havana. The noise of battle was heard in Havana, and there the 64-gun frigate Lealtad put to sea. Guerrero was able to break off the action and escape, but overnight Captain Porter rashly decided to circle back and attack the vessels still at Mariel. Intercepted again by Lealtad, he could not escape this time. In the course of the ensuing battle, Midshipman Porter received his first (minor) wound, and Captain Porter was killed, together with many of his crew. The survivors surrendered and were imprisoned in Havana until they could be exchanged. Commodore Porter chose not to risk his son again, and sent him back to the United States by way of New Orleans.

David Dixon Porter obtained an official appointment as midshipman in the US Navy through his grandfather, Congressman William Anderson. The appointment was dated February 2, 1829, when he was sixteen years of age; this was somewhat older than most midshipmen of the time. His relative maturity and his experience, already greater than that of most naval lieutenants, bred in him a certain cockiness and willingness to challenge those above him. As a result, his warrant as a midshipman would not have been renewed except for extraordinary intervention by Commodore James Biddle, who acted favorably not because Porter deserved it but because his father was a hero.

Porter's last duty as a midshipman was on frigate USS United States, flagship of Commodore Daniel Patterson, on a cruise that lasted from June 1832 until October 1834. The major importance of the cruise for Porter was that Patterson's family accompanied him. The family included his daughter, George Ann ("Georgy"), and the two young people renewed their acquaintance. Although marriage would have to wait, the couple became engaged. After Porter returned home, he completed the examination for passed midshipman, and soon after was assigned to duty in the Coast Survey. There, his pay was such that he could save enough to marry. He and Georgy were united on March 10, 1839.

In March 1841, he was advanced in rank to lieutenant, and in April of the next year he was detached from the Coast Survey. He had a brief tour of duty in the Mediterranean, and then he was assigned to the US Navy's Hydrographic Office.

In 1846, the era of peace was coming to a close. The United States had annexed the Republic of Texas, and the islands of the Caribbean seemed to be likely targets for further expansion. The Republic of Santo Domingo (the present-day Dominican Republic) had broken off from the Republic of Haiti in 1844, and the United States State Department needed to determine the new nation's social, political, and economic stability. The suitability of the Bay of Samana for US Navy operations was also of interest. To find out, Secretary of State James Buchanan asked Porter to undertake a private investigation. He accepted the assignment, and on March 15, 1846, he left home. He arrived in Santo Domingo after some unexpected delays and spent two weeks mapping the coastline. On May 19, he began a trek through the interior that left him without communication for a month. On June 19, he emerged from the jungle, bitten by insects, but with the information that the State Department wanted. He then discovered that while he was away the United States had gone to war with Mexico.

Mexico did not have a real navy, so naval personnel had little opportunity for distinction. Porter served as first lieutenant of the sidewheel gunboat USS Spitfire under Commander Josiah Tattnall. Spitfire was at Vera Cruz when General Winfield Scott led the amphibious assault on the city, which was shielded by a series of forts and the ancient Castle of San Juan de Ulloa. Porter had spent many hours exploring the castle when he had been a midshipman in the Mexican Navy, so he was familiar with both its strengths and its weaknesses. He submitted a plan to attack it to Captain Tattnall. Taking eight oarsmen and the ship's gig, he sounded out a channel on the night of March 22–23, 1847, using the experience he had gained with the Coast Survey. The next morning, Spitfire and other vessels taking part in the bombardment followed the channel that Porter had laid out and took up positions inside the harbor, where they were able to pound the forts and castle. Doing so meant, however, that they had to run by the forts, which was contrary to the orders of Commodore Matthew C. Perry. Perry sent signals ordering the vessels to break off the bombardment and return, but Tattnall ordered his men not to look at the commodore's signals. Not until a special messenger came with explicit orders to retire did Maffitt cease firing. Perry appreciated the audacity shown by his subordinates, but did not approve of the way they had disregarded his orders. Henceforth, he kept Spitfire by his side.

In June, Perry mounted an expedition to capture the interior town of Tabasco. Porter on his own led a charge of 68 sailors to capture the fort defending the city. Perry rewarded him for his initiative by making him captain of Spitfire. It was his first command. It brought him no advantages, however, as the naval part of the war was essentially over.

In Washington again following the war, Porter had little chance for professional improvement and none for advancement. In order to gain experience in handling steamships, he took leave of absence from the Navy to command civilian ships. He insisted that his crews submit to the methods of military discipline; his employers were noncommittal about his methods, but they were impressed by the results. They asked him to stay in Australia, but his health and the health of his eldest daughter Georgianne persuaded him to return. Back in the United States, he moved his family from Washington to New York in hope that the climate would benefit his daughter, but she died shortly after the move. His second daughter, Evalina ("Nina") also died in the interwar period.

Once again on active duty, he commanded the storeship USS Supply in a venture to bring camels to the United States. The project was promoted by Secretary of War Jefferson Davis, who thought that the desert animals could be useful for the cavalry in the arid Southwest. Supply made two successful trips before Secretary Davis left office and the experiment was discontinued.

In 1859, he received an attractive offer from the Pacific Mail Steamship Company to be captain of a ship then under construction. The offer would be effective when she was complete. He would have accepted, but he was delayed in his departure. Before he could leave, war had broken out again.

The seceded states laid claim to the national forts within their boundaries, but they did not make good their claim to Fort Sumter in South Carolina and Forts Pickens, Zachary Taylor, and Jefferson in Florida. They soon made it clear that they would use force if necessary to gain possession of Fort Sumter and Fort Pickens. President Abraham Lincoln resolved not to cede them without a fight. Secretary of State William H. Seward, Captain Montgomery C. Meigs of the US Army, and Porter devised a plan for the relief of Fort Pickens. The principal element of their plan required use of the steam frigate USS Powhatan, which would be commanded by Porter and would carry reinforcements to the fort from New York. Because no one was above suspicion in those days, the plan had to be implemented in complete secrecy; not even Secretary of the Navy Gideon Welles was to be advised. Welles was in the meantime preparing an expedition for the relief of the garrison at Fort Sumter. As he was unaware that Powhatan would not be available, he included it in his plans. When the other vessels assigned to the effort showed up, the South Carolina troops at Charleston began to bombard Fort Sumter, and the Civil War was on. The relief expedition could only wait outside the harbor. The expedition had little chance to be successful in any case; without the support of the guns on Powhatan, it was completely impotent. The only contribution made by the expedition was to carry the soldiers who had defended Fort Sumter back to the North following their surrender and parole.

Lincoln did not punish Seward for his part in the incident, so Welles felt that he had no choice but to forgive Porter, whose culpability was less. Later, he reasoned that it had at least a redeeming feature in that Porter, whose loyalty had been suspect, was henceforth firmly attached to the Union. As he wrote,

"In detaching the Powhatan from the Sumter expedition and giving the command to Porter, Mr. Seward extricated that officer from Secession influences, and committed him at once, and decisively, to the Union cause."

In late 1861, the Navy Department began to develop plans to open the Mississippi River. The first move would be to capture New Orleans, Louisiana. For this Porter, by this time advanced to rank of commander, was given the responsibility of organizing a flotilla of some twenty mortar boats that would participate in the reduction of the forts defending the city from the south. The flotilla was a semi-autonomous part of the West Gulf Blockading Squadron, which was to be commanded by Porter's adoptive brother Captain David G. Farragut. The bombardment of Fort Jackson and Fort St. Philip began on April 18, 1862. Porter had opined that two days of concentrated fire would be enough to reduce the forts, but after five days they seemed as strong as ever. The mortars were beginning to run low on ammunition. Farragut, who put little reliance on the mortars anyway, made the decision to bypass the forts on the night of April 24. The fleet successfully ran past the forts; the mortars were left behind, but they bombarded the forts during the passage in order to distract the enemy gunners. Once the fleet was above the forts, nothing significant stood between them and New Orleans; Farragut demanded the surrender of the city, and it fell to his fleet on April 29. The forts were still between him and Porter's mortar fleet, but when the latter again began to pummel Fort Jackson, its garrison mutinied and forced its surrender. Fort St. Philip had to follow suit. Surrender of the two forts was accepted by Commander Porter on April 28.

Following orders from the Navy Department, Farragut took his fleet upstream to capture other strongpoints on the river, with the aim of complete possession of the Mississippi. At Vicksburg, Mississippi, he found that the bluffs were too high to be reached by the guns of his fleet, so he ordered Porter to bring his mortar flotilla up. The mortars suppressed the Rebel artillery well enough that Farragut's ships could pass the batteries at Vicksburg and link up with a Union flotilla coming down from the north. The city could not be taken, however, without active participation by the army, which did not happen. On July 8, the bombardment ceased when Porter was ordered to Hampton Roads to assist in Major General George B. McClellan's Peninsula campaign. A few days later, Farragut followed, and the first attempt to take Vicksburg was over.

In the summer of 1862, shortly after Porter left Vicksburg, the US Navy was extensively modified; among the features of the revised organization were a set of officer ranks from ensign to rear admiral that paralleled the ranks in the Army. Among the new ranks created were those of commodore and rear admiral. According to the organization charts, the persons in command of the blockading squadrons were to be rear admirals. Another part of the reorganization transferred the Western gunboat flotilla from the army to the navy, and retitled it the Mississippi River Squadron. The change of title implied that it was formally equivalent to the other squadrons, so its commanding officer would likewise be a rear admiral. The problem was that the commandant of the gunboat flotilla, Flag Officer Charles H. Davis, had not shown the initiative that the Navy Department wanted, so he had to be removed. He was made rear admiral, but he was recalled to Washington to serve as chief of the Bureau of Navigation. Most of the men who could have replaced Davis were either less suitable or were unavailable because of other assignments, so finally Secretary Welles decided to appoint Porter to the position. He did this despite some doubt. As he wrote in his Diary,

Relieved Davis and appointed D.D. Porter to the Western Flotilla, which is hereafter to be recognized as a squadron. Porter is but a Commander. He has, however, stirring and positive qualities, is fertile in resources, has great energy, excessive and sometimes not over-scrupulous ambition, is impressed with and boastful of his own powers, given to exaggeration in relation to himself, — a Porter infirmity, — is not generous to older and superior living officers, whom he is too ready to traduce, but is kind and patronizing to favorites who are juniors, and generally to official inferiors. Is given to cliquism but is brave and daring like all his family. . . . It is a question, with his mixture of good and bad traits, how he will succeed.

Thus Commander Porter became Acting Rear Admiral Porter without going through the intermediate ranks of captain and commodore. He left Washington for his new command on October 9 and arrived in Cairo, Illinois, on October 15.

Secretary of War Edwin Stanton considered Porter "a gas bag . . . blowing his own trumpet and stealing credit which belongs to others." Historian John D. Winters, in his The Civil War in Louisiana, describes Porter as having "possessed the qualities of abundant energy, recklessness, resourcefulness, and fighting spirit needed for the trying role ahead. Porter was assigned the task of aiding General John A. McClernand in opening the upper Mississippi. The choice of McClernand, a volunteer political general, pleased Porter because he felt that all West Point men were 'too self-sufficient, pedantic, and unpractical.'" Winters also writes that Porter "revealed a weakness he was to display many times: he belittled a superior officer [Charles H. Poor]. He often heaped undue praise upon a subordinate, but rarely could find much to admire in a superior."

The Army was showing renewed interest in opening the Mississippi River at just this time, and Porter met two men who would have great influence on the campaign. First was Major General William T. Sherman, a man of similar temperament to his own, with whom he immediately formed a particularly strong friendship. The other was Major General McClernand, whom he just as quickly came to dislike. Later they would be joined by Major General Ulysses S. Grant; Grant and Porter became friends and worked together quite well, but it was on a more strictly professional level than his relation with Sherman.

Close cooperation between the Army and Navy was vital to the success of the siege of Vicksburg. The most prominent contribution to the campaign was the passage of the batteries at Vicksburg and Grand Gulf by a major part of the Mississippi River Squadron. Grant had asked merely for a few gunboats to shield his troops, but Porter persuaded him to use more than half of his fleet. After nightfall on April 16, 1863, the fleet moved past the batteries. Only one vessel was lost in the ensuing firefight. Six nights later, a similar run past the batteries gave Grant the transports he needed for crossing the river. Now south of Vicksburg, Grant at first tried to attack the Rebels through Grand Gulf, and requested Porter to eliminate the batteries there before his troops would be sent across. On April 29, the gunboats spent most of the day bombarding two Confederate forts. They succeeded in silencing the lower of the two, but the upper fort remained. Grant called off the assault and moved downstream to Bruinsburg, where he was able to cross the river unopposed.

Although the fleet made no major offensive contributions to the campaign after Grand Gulf, it remained important in its secondary role of keeping the blockade against the city. When Vicksburg was besieged, the encirclement was made complete by the Navy's control of the Mississippi and Yazoo Rivers. When it finally fell on July 4, Grant was unstinting in his praise of the assistance he had received from Porter and his men. For his contribution to the victory, Porter's appointment as "acting" rear admiral was made permanent, dated from July 4.

After the opening of the Mississippi, the political general Nathaniel P. Banks, who was in charge of army forces in Louisiana, brought pressure on the Lincoln administration to mount a campaign across Louisiana and into Texas along the line of the Red River. The ostensible purpose was to extend Union control into Texas, but Banks was influenced by numerous speculators to convert the campaign into little more than a raid to seize cotton. Admiral Porter was not in favor; he thought that the next objective of his fleet should be to capture Mobile, but he received direct orders from Washington to cooperate with Banks.

After considerable delays caused by Banks's attention to political rather than military matters, the Red River expedition got under way in early March 1864. From the start, navigation of the river presented as great a problem for Porter and his fleet as did the Confederate army that opposed them. The army under Banks and the navy under Porter did little to cooperate, and instead often became rivals in a race to seize cotton. The Rebel opposition under Major General Richard Taylor succeeded in keeping them apart by defeating Banks at a small place known as Pleasant Hills, following which Banks gave up the expedition. From that time on, Porter's primary task was to extricate his fleet. The task was made difficult by falling water levels in the river, but he ultimately got most out, with the help of heroic efforts by some of the soldiers who stayed to protect the fleet.

By late summer 1864, Wilmington, North Carolina was the only port open for running the blockade, and the Navy Department began to plan to close it. Its major defense was Fort Fisher, a massive structure at the New Inlet to the Cape Fear River. Secretary Welles believed that the head of the North Atlantic Blockading Squadron, Rear Admiral Samuel Phillips Lee, was inadequate for the task, so he at first assigned Rear Admiral Farragut to be Lee's replacement. Farragut was too ill to serve, however, so Welles then decided to switch Lee with Porter: Lee would command the Mississippi River Squadron, and Porter would come east and prepare for the attack on Fort Fisher.

The planned attack on Fort Fisher required the cooperation of the army, and the troops were taken from the Army of the James. It was expected that Brigadier General Godfrey Weitzel would command, but Major General Benjamin F. Butler, the commandant of the Army of the James, exercised one of the prerogatives of his position to install himself as leader of the expedition. Butler proposed that the fort could be flattened by exploding a ship filled with gunpowder near it, and Porter accepted the idea; if successful, the scheme would avoid a protracted siege or its alternative, a frontal assault. Accordingly, the old steamer USS Louisiana was packed with powder and blown up in the early morning of December 24, 1864. It had, however, no discernible effect on the fort. Butler brought part of his troops ashore, but he was already convinced that it was hopeless, so he removed his force before making an all-out assault.

Porter, enraged by Butler's timorousness, went to U. S. Grant and demanded that Butler be removed. Grant agreed, and placed Major General Alfred H. Terry in charge of a second assault on the fort. The second assault began on January 13, 1865, with unopposed landings and bombardment of the fort by the fleet. Porter imposed new methods of bombardment this time: each ship was assigned a specific target, with intent to destroy the enemy's guns rather than to knock down the walls. They were also to continue firing after the men ashore started their assault; the ships would shift their aim to points ahead of the advancing troops. The bombardment continued for two more days, while Terry got his men into position. On the 15th, frontal assaults on opposite faces by Terry's soldiers on the land side and 2000 sailors and marines on the beach vanquished the fort. This was the last significant naval operation of the war.

The US Navy was rapidly downsized at the end of the war, and Porter, like most of his contemporaries, had no more ships to command. Some feared that at sea he might provoke a foreign war, particularly with Great Britain, because of what he saw as their support for the Confederacy. To make use of his undeniable talents, Secretary Welles appointed him superintendent of the Naval Academy in 1865. The academy at that time did little to prepare men for the duties that were expected of them. Porter resolved to change that; he determined to make the Academy the rival of the Military Academy at West Point. The curriculum was revised to reflect the reality of naval life, organized sports were encouraged, discipline was enforced, and even social graces were taught. An honor system was installed, "to send honorable men from this institution into the Navy." To be sure that his reforms would remain in place after his departure, he brought to the faculty a group of like-minded men, mostly young officers who had distinguished themselves in the war.

When Porter's friend Ulysses S. Grant became president in 1869, he appointed Philadelphia businessman Adolph E. Borie as Secretary of the Navy. Borie had no knowledge of the navy and little desire to learn, so he leaned on Porter for advice that the latter was quite willing to give. In a short time, Borie came to defer to him even on trivial routine matters. Porter used his influence with the secretary to push through several policies to shape the navy as he wanted it; in the process, he made a new set of enemies who either were harmed by his actions or merely resented his blunt methods. Borie was strongly criticized for his failure to control his subordinate, and after three months he resigned. The new secretary, George Robeson, promptly curtailed Porter's powers.

In 1866, the ranks of admiral and vice admiral were created in the US Navy. Naval hero Farragut was named as the nation's first admiral, and Porter became vice admiral at the same time. In 1871, Farragut died, and it was expected that Porter would be promoted to fill the vacancy. Eventually, he did become the second admiral, but it was after much controversy that was provoked by his many enemies. Among them were several very powerful politicians, including some of the political generals he had contended with in the war.

Despite the prestige of the high rank, his eclipse continued. For the last twenty years of his life, he had little to do with the operations of the navy. He turned to writing, producing some histories that are of doubtful reliability but provide insights into his own beliefs and character. He also wrote some fiction of a sort that has not withstood the test of time. After twenty years of semi-retirement, his health began to give way. In the summer of 1890 he suffered a heart attack; he survived but was clearly in decline. He died on the morning of February 13, 1891.