Our Lady also protected Alan de Lanvallay, a Breton Knight, from great perils. He too was fighting for the Faith against the Albigensians. One day when he found himself surrounded by enemies on all sides Our Lady let fall one hundred and fifty rocks upon his enemies and he was delivered from their hands. Another day when his ship foundered and was about to sink, the Blessed Mother caused one hundred and fifty small hills to appear miraculously above the water and by means of them they reached Brittany in safety.
He built a monastery at Dinan for the religious of St. Dominic, in thanksgiving to Our Lady for all the miracles that she had worked on his behalf in answer to his daily Rosary. Having become a religious himself he died a holy death at Orleans.
Othère was also a Breton soldier, from Vaucouleurs, and he often put whole companies of heretics or robbers to flight unaided, wearing his Rosary on his arm or carrying it on the hilt of his sword. Once when he had beaten them his enemies admitted that they had seen his sword gleam and that another time they had noticed a shield on his arm which had pictures of Our Lord and Our Lady and the Saints upon it. This shield made him invisible and gave him the strength to attack well.
Another time he defeated twenty thousand heretics with only ten companies and without losing a single man. This so impressed the general of the heretics' army that he came to see OthÃ¨re afterwards, abjured his heresy and declared publicly that he had seen him surrounded by flaming swords during the battle.
From page 79 and 80
Nihil Obstat, Gulielmus F. Hughes, S.T.L., Censor Librorium
Imprimatur, Thomas Edmundus Molloy, S.T.D., Archiepiscopus-Episcopus Brooklyniensis, 1954 For more, see The Holy Rosary
St. Louis-Marie Grignon de Montfort's The Secret of the Rosary