The background story to Nôtre Dame de Bons Secours, from the Catholic Community Forum:
O most Holy Virgin Mary, if you obtain for me a prompt and favorable answer to this letter, I promise to have you honored at New Orleans under the title of Our Lady of Prompt Succor.
and sent her letter on 19 March 1809. Against all odds, she received a response on 29 April 1809. The pope granted her request, and Mother Saint Michel, commissioned a statue of Our Lady of Prompt Succor holding the Infant Jesus. Bishop Fournier blessed the statue and Mother’s work.
Mother Saint Michel and several postulants came to New Orleans on 31 December 1810. They brought the statue with them, and placed it in the monastery chapel. Since then, Our Lady of Prompt Succor has interceded for those who have sought her help.
A great fire threatened the Ursuline monastery in 1812. A lay sister brought the statue to the window and Mother Saint Michel prayed
Our Lady of Prompt Succor, we are lost if you do not come to our aid.
The wind changed direction, turned the fire away, and saved the monastery.
Our Lady interceded again at the Battle of New Orleans in 1815. Many faithful, including wives and daughters of American soldiers, gathered in the Ursuline chapel before the statue of Our Lady of Prompt Succor, and spent the night before the battle in prayer. They asked Our Lady for the victory of the American forces over the British, which would save the city from being sacked. General Andrew Jackson and two hundred men from around the South won a remarkable victory over a superior British force in a battle that lasted twenty-five minutes, and saw few American casualties.
It is still customary for the devout of New Orleans to pray before the statue of Our Lady of Prompt Succor whenever a hurricane threatens New Orleans.
Hat tip: Irish Elk. The image used below is of the National Shrine of Our Lady of Prompt Succor in New Orleans.