On 18 June 1429 the French vanguard caught the English field army before it could form its battle line near Patay, destroying it and capturing John Talbot — the reverse image of Agincourt.
The battle of Patay, fought on 18 June 1429 on the plain north of Orléans, completed what the relief of the city had begun. For the first time in the war, a French army destroyed an English field army in open country — not by outlasting it in a siege, but by catching it at its moment of weakness and striking before the famous defensive line could form.
The numbers tell the story of how completely the pattern of the war inverted. At Agincourt the French had lost thousands against a few hundred English dead. At Patay the English lost perhaps 2,000 to 2,500 killed or captured out of some 5,000; French casualties were reported in the tens. The English commander John Talbot — the most feared soldier of Lancastrian France — began the day directing a rearguard and ended it a prisoner.
After abandoning the siege of Orléans on 8 May 1429, the English tried to hold their chain of Loire towns. The French army, with Joan of Arc accompanying and the Duke of Alençon in command, took them in quick succession in mid-June: Jargeau on the 12th, where Suffolk was captured; the Meung bridge on the 15th; Beaugency, surrendered on the 17th. That same day Sir John Fastolf arrived from Paris with reinforcements, joining Talbot's troops.
The English commanders disagreed about what to do next — Fastolf, by his own later account, urged withdrawal; Talbot insisted on standing. When Beaugency's fall removed the last reason to remain, the combined army began retreating north toward Janville and Paris on the morning of 18 June, with the French army following at speed. Joan, asked whether to pursue, reportedly answered that they would need good spurs, for the enemy would be beaten.
The English plan for facing pursuit was the standard one: find good ground, dismount, plant the archers' stakes, and let the French break themselves on the line. Near Patay, Talbot posted some five hundred picked archers as a screen along a sunken road to buy time while the main body formed on high ground behind. It was the system of Crécy and Agincourt — but it needed minutes the French did not grant.
A stag blundering through the English positions drew a shout from the hidden archers, betraying their position to the French scouts. The vanguard of French heavy cavalry — some 1,500 men under La Hire and Xaintrailles — charged immediately, without waiting for the main body. The stakes were not planted; the screen was ridden down from the flank, and the cavalry rolled straight on into the main body still forming up. Fastolf's mounted division, unable to reach the line in time, turned for Janville; the sight broke what remained of English cohesion, and the battle became a slaughter of infantry caught in open country by armoured horsemen.
Talbot was taken prisoner — he remained in French hands for four years — and Fastolf reached Paris with the survivors, where Bedford stripped him of the Garter for leaving the field, restoring it only after an inquiry. The English field presence between the Loire and Paris ceased to exist for the rest of the campaign season.
The road north lay open, and Charles VII used it for the purpose Joan had urged from the beginning: the coronation march. Town after town opened its gates — Auxerre, Troyes, Châlons — and on 17 July 1429, twenty-nine days after Patay, Charles was anointed King of France at Reims. The battle's political product was the legitimacy of the Valois crown.
Patay demolished the myth of the invincible English tactical system by demonstrating its precondition: time to deploy. French commanders had absorbed the lessons of a century of defeats — do not charge a prepared line; strike before it exists. The mounted vanguard that won Patay was the instrument of that doctrine, and it pointed toward the professional compagnies d'ordonnance with which Charles VII would finish the war.
For the longbow itself, Patay began the eclipse that Formigny and Castillon completed a generation later, when artillery joined cavalry in making the static archer line obsolete. The weapon that had defined the war at Crécy, Poitiers, and Agincourt never won another great battle in France.