 His weak leadership was probably the most important factor in ending the conflict.Kelly DeVries argues that Joan of Arc's aggressive use of artillery and frontal assaults influenced French tactics for the rest of the war.In 1452, during the posthumous investigation into her execution, the Church declared that a religious play in her honor at Orléans would allow attendees to gain an indulgence (remission of temporal punishment for sin) by making a pilgrimage to the event.