Joan asserted that she had visions from God that told her to recover her homeland from English domination late in the Hundred Years' War. The uncrowned King Charles VII sent her to the siege at Orléans as part of a relief mission. She gained prominence when she overcame the dismissive attitude of veteran commanders and lifted the siege in only nine days. Several more swift victories led to Charles VII's coronation at Reims and settled the disputed succession to the throne.
http://en.wikipedia.org/wiki/Joan_of_Arc