During the five months before her arrival, the defenders had attempted only one offensive assault, which had ended in defeat. On 4 May, however, the Armagnacs attacked and captured the outlying fortress of Saint Loup bastille de Saint-Loup , followed on 5 May by a march to a second fortress called Saint-Jean-le-Blanc , which was found deserted.
When English troops came out to oppose the advance, a rapid cavalry charge drove them back into their fortresses, apparently without a fight. The Armagnacs then attacked and captured an English fortress built around a monastery called Les Augustins. That night, Armagnac troops maintained positions on the south bank of the river before attacking the main English stronghold, called "les Tourelles", on the morning of 7 May.
She was wounded by an arrow between the neck and shoulder while holding her banner in the trench outside les Tourelles, but later returned to encourage a final assault that succeeded in taking the fortress. The lifting of the siege was interpreted by many people to be that sign, and it gained her the support of prominent clergy such as the Archbishop of Embrun and the theologian Jean Gerson , both of whom wrote supportive treatises immediately following this event. This was a bold proposal because Reims was roughly twice as far away as Paris and deep within enemy territory.
Joan urged the Armagnacs to pursue, and the two armies clashed southwest of the village of Patay. The battle at Patay might be compared to Agincourt in reverse.
The French vanguard attacked a unit of English archers who had been placed to block the road. A rout ensued that decimated the main body of the English army and killed or captured most of its commanders. Fastolf escaped with a small band of soldiers and became the scapegoat for the humiliating English defeat. The French suffered minimal losses. The citizens of Troyes hand over city keys to the Dauphin and Joan The French army left Gien on 29 June on the march toward Reims and accepted the conditional surrender of the Burgundian-held city of Auxerre on 3 July.
