1471 engagement in the Wars of the Roses
The Battle of Barnet was a decisive engagement in the Wars of the Roses, a dynastic conflict of 15th-century England. The military action, along with the subsequent Battle of Tewkesbury, secured the throne for Edward IV. 
On Sunday 14 April 1471, Easter Day, near Barnet, then a small Hertfordshire town north of London, Edward led the House of York in a fight against the House of Lancaster, which backed Henry VI for the throne. Leading the Lancastrian army was Richard Neville, Earl of Warwick, who played a crucial role in the fate of each king. Historians regard the battle as one of the most important clashes in the Wars of the Roses, since it brought about a decisive turn in the fortunes of the two houses. Edward's victory was followed by 14 years of Yorkist rule over England.
Formerly a key figure in the Yorkist cause, Warwick defected to the Lancastrians over disagreements about Edward's nepotism, secret marriage, and foreign policy. Leading a Lancastrian army, the earl defeated his former allies, forcing Edward to flee to Burgundy in October 1470. The Yorkist king persuaded his host, Charles the Bold, the Duke of Burgundy, to help him regain the English throne. Leading an army raised with Burgundian money, Edward launched his invasion of England, which culminated at the fields north of Barnet. Under cover of darkness, the Yorkists moved close to the Lancastrians and clashed in a thick fog at dawn. As both armies fought, the Earl of Oxford on the Lancastrian right routed the Yorkists opposite under Lord Hastings, chasing them back to Barnet. On their return to the battlefield, Oxford's men were erroneously shot at by the Lancastrian centre commanded by Lord Montagu. As cries of treason (always a possibility in that chaotic period) spread through their line, Lancastrian morale was disrupted and many abandoned the fight. While retreating, Warwick was killed by Yorkist soldiers.
Warwick had been such an influential figure in 15th-century English politics that, on his death, no one matched him in terms of power and popularity. Deprived of Warwick's support, the Lancastrians suffered their final defeat at the Battle of Tewkesbury on 4 May, which marked the end of the reign of Henry VI and the restoration of the House of York. Three centuries after the Battle of Barnet, a stone obelisk was raised on the spot where Warwick purportedly died.
Background.
The Wars of the Roses were a series of conflicts between various English lords and nobles in support of two different royal families descended from Edward III. In 1461 the conflict reached a milestone when the House of York supplanted its rival, the House of Lancaster, as the ruling royal house in England. Edward IV, leader of the Yorkists, seized the throne from the Lancastrian king, Henry VI, who was captured in 1465 and imprisoned in the Tower of London. His wife, Margaret of Anjou, and their son, Edward of Westminster, fled to Scotland and organised resistance. Edward IV crushed the uprisings and pressured the Scottish government to force Margaret out; the House of Lancaster went into exile in France. As the Yorkists tightened their hold over England, Edward rewarded his supporters, including his chief adviser, Richard Neville, 16th Earl of Warwick, elevating them to higher titles and awarding them land confiscated from their defeated foes. The Earl grew to disapprove of the King's rule, however, and their relationship later became strained.
Warwick had planned for Edward to marry a French princess—Bona of Savoy, sister-in-law to Louis XI of France—to create an alliance between the two countries. The young king, however, favoured ties with Burgundy and, in 1464, further angered the Earl by secretly marrying Elizabeth Woodville; as an impoverished Lancastrian widow, she was regarded by the Yorkists as an unsuitable queen. Edward bestowed gifts of land and titles on her relations and arranged their marriages to rich and powerful families. Eligible bachelors were paired with the Woodville females, narrowing the marriage prospects for Warwick's daughters. Furthermore, the Earl was offended by two matches involving his kin. The first was the marriage of his aunt, Lady Katherine Neville, over 60 years old, to Elizabeth's 20-year-old brother, John Woodville, a pairing considered outside of normal wedlock by many people. The other was his nephew's fiancée, the daughter of Henry Holland, 3rd Duke of Exeter, who was taken as a bride by the Queen's son, Thomas Grey, with Edward's approval. Exasperated by these acts, Warwick decided the Woodvilles were a malignant influence on his liege. He felt marginalized: his influence over the young king was failing, and he decided to take drastic action to force Edward's compliance. Warwick's alternative plan was to replace the King with his fellow conspirator, the Duke of Clarence, Edward's younger brother.
Instigating several rebellions in the north, Warwick lured the King away from his main bastion of support in the south. Edward found himself outnumbered; while retreating, he learned that Warwick and Clarence had called for open support of the rebellion. After winning the Battle of Edgcote on 26 July 1469, the Earl found the Yorkist king deserted by his followers, and brought him to Warwick Castle for "protection". Lancastrian supporters took advantage of Edward's imprisonment to stage uprisings. Because most Yorkist-aligned warlords refused to rally to Warwick's call, the Earl was pressured to release the King. Back in power, Edward did not openly pursue Warwick's transgressions against him, but the Earl suspected that the King held a grudge. Warwick engineered another rebellion, this time to replace Edward with Clarence. The two conspirators, however, had to flee to France when Edward crushed the uprising—the Battle of Losecoat Field—on 12 March 1470. Through letters in the rebels' possession and confessions from the leaders, the King uncovered the Earl's betrayal. In a deal brokered by the French king, Louis XI, the Earl agreed to serve Margaret and the Lancastrian cause. Warwick invaded England at the head of a Lancastrian army and, in October 1470, forced Edward to seek refuge in Burgundy, then ruled by the King's brother-in-law Charles the Bold. The throne of England was temporarily restored to Henry VI; on 14 March 1471, Edward brought an army back across the English Channel, precipitating the Battle of Barnet a month later.
Commanders.
Yorkist.
Edward IV was normally at the forefront of his armies. Standing , he was an inspiring figure in combat, attacking foes while wearing a suit of gilded armour. Medieval texts describe the King as handsome, finely muscled and with a broad chest. He was personable and charismatic, easily winning people to his cause. Edward was a capable tactician and leader in battles. He frequently spotted and exploited defensive frailties in enemy lines, often with decisive results. By 1471 the young king was a highly respected field commander. He received some criticism, however; after winning the throne in 1461, he proved indecisive about putting down rebellions. Historian Charles Ross praises Edward's leadership and skill in close combat rather than his strategies and tactics. 
With his good looks and capable leadership, Edward was popular among the common people, especially compared to Henry VI. His trade policies, which aimed to expand and protect markets for English commerce, pleased local merchants, who were also won over by the Yorkist king's personality. By 1469 Edward's groundswell of popular support had eroded. The euphoria of a change in government had ebbed and the people blamed Edward for failing to "bring the realm of England in[to] great popularity and rest" and allowing Yorkist nobles to go unpunished for abuses. When Edward invaded England in 1471, not many common people openly celebrated his return.
Edward was joined at Barnet by his brothers, Richard, Duke of Gloucester, and George, Duke of Clarence. Unlike his eldest brother, Gloucester was slender and seemingly delicate. He was 18 years old at the Battle of Barnet, his first major engagement. His military prowess, however, was well respected; many historians judge him a capable warrior and military leader. Clarence was not as well regarded as his brothers, especially in matters of loyalty. When Edward became king, Clarence became his heir; however, Edward's marriage to Elizabeth Woodville threatened to displace the Duke in the line of succession to the throne. Hence, Clarence participated in Warwick's schemes, marrying the Earl's daughter Isabel, believing he could gain his brother's throne. Clarence lost faith in the Earl when Warwick defected to the Lancastrians and married off his other daughter, Anne, to their prince in order to cement his new allegiance. When Edward launched his campaign to retake England, Clarence accepted his brother's offer of pardon and rejoined the Yorkists at Coventry on 2 April 1471. The last of the Yorkist commanders was William, Lord Hastings, a loyal subject since the start of the wars. Hastings had accompanied the young king in exile and supported his return. The courtier was rewarded for his faithfulness, gaining the lieutenancy of Calais in 1471 and becoming Edward's lord chamberlain and primary confidant.
Lancastrian.
Warwick had fought for the House of York since the early stages of the Wars of the Roses and alongside his cousin, Edward IV, in many of the battles. His years of loyalty earned him the trust of the Yorkists, and his victories—both political and military—and popularity with the common people made him an important figure. He had powerful influence over the line of succession, earning him the nickname "The Kingmaker". Early historians described him as a military genius, but by the 20th century his tactical acumen was reconsidered; Philip Haigh suspects that the Earl largely owed some of his victories, such as the First Battle of St Albans, to being in the right place at the right time. Christopher Gravett believes the Earl was too defensive and lacked mental flexibility.
John Neville, 1st Marquess of Montagu, was less ambitious than his brother Warwick, but a more capable warrior and tactician. In 1464 he commanded a Yorkist force that turned the tables on a Lancastrian ambush at the Battle of Hedgeley Moor and launched a surprise attack at the Battle of Hexham. These victories capped Neville's extensive service in the north, and Edward rewarded him with the Earldom of Northumberland, which bore substantial income. The gift was particularly gratifying for Neville; his family had experienced a deep feud with the former earls of Northumberland, the Percys, who supported the House of Lancaster. However, in March 1470, Edward, trying to win over the Percys' support, reinstated Henry Percy to the earldom. As recompense, Neville received the grander title of Marquess of Montagu; however, the lands accompanying this rank were much poorer than the estate he had lost. The new marquess saw it as an insult—an insubstantial title that was inadequate recognition for his years of faithful service. Montagu did not immediately join Warwick's rebellion, however; he defected later in the year when his brother invaded England.
Not much is known about the early history of John de Vere, 13th Earl of Oxford, another Lancastrian commander; the chronicles mention little about him until the Battle of Losecoat Field. His father, the previous earl and a loyal Lancastrian, was executed for a failed plot to assassinate Edward IV. The Yorkist king tried to secure the loyalty of Oxford by knighting him and pardoning his transgressions. This tactic failed; Oxford remained true to the Lancastrian crown and participated in Warwick's effort to dethrone Edward. Historians describe the young Oxford as a decent military leader, exemplified by his conduct in the Battle of Barnet.
Although Henry Holland, 3rd Duke of Exeter, was of royal blood, he was commonly viewed as a criminal, prone to violence and stupidity. A proven enemy of the Nevilles, Exeter bore a grudge particularly against Warwick for displacing him from his hereditary role of Lord High Admiral in 1457. Nonetheless, when Warwick joined the Lancastrians, Exeter obeyed Margaret and served under the Earl during the invasion of England. Although he supported the Lancastrian cause, Exeter had family ties to the House of York; he was husband to Anne of York, Edward's sister.
Prelude.
On 14 March 1471, Edward's army landed at Ravenspurn. Gathering more men as they went, the Yorkists moved inland towards York. Edward's march was unopposed at the beginning because he was moving through lands that belonged to the Percys, and the Earl of Northumberland was indebted to the Yorkist king for the return of his