All that she is currently known for is an act of heroism on June 27 1472, when she prevented the capture of Beauvais by the troops of Charles the Bold, Duke of Burgundy. The town was defended by only 300 men-at-arms, commanded by Louis de Balagny.
The Burgundians were making an assault, and one of their members had actually planted a flag upon the battlements, when Jeanne, axe in hand, flung herself upon him, hurled him into the moat, tore down the flag, and revived the drooping courage of the garrison.
From Wikipedia
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