The Knight of the White Lily

(from ebookjapan):

In 1429, France was in danger of being attacked by the Kingdom of England. The castle of Orleans was besieged by English troops, food was running out, and all they could do was wait for the English to surrender or starve to death.

The English army also approaches the village of Jeanne, the third daughter of the Arc, who is worried about the castle of Orléans.

The village is overrun by the English, and Jeanne, who is left behind with the young child Marse, hears the voice of the archangel Michael telling her to save France.... A magnificent historical romance begins!