From the Ays Indians, west of the Sabine river, Father Margil heard of the Adayes Indians, and in March, 1717, he located them near Spanish Lake, in what became Sabine Parish, Louisiana, founded the mission of San Miguel de Linares and built there probably the first church in Louisiana, for according to the historian Martin, when Pere Charlevoix reached New Orleans in 1721, he found there "about 100 cabins, two or three dwelling houses and a miserable storehouse which had been at first occupied as a chapel, a shed being now used for that purpose".
In 1718, during the brief war with Spain, Blondel, the French Commandant at Natchitoches, invaded the Adayes mission, plundered it and carried away the church vestments.
Father Margil heard of it, and in 1721 came back, hunted up the Adayes who had taken refuge in the forests for fear of the French, rebuilt their church, which he dedicated to Our Lady of the Pillar, the patroness of the expedition.
The Catholics located on the rivers of the state often drifted to New Orleans on barges to have their marriages blessed and their children baptized, and come back cordelling their boats.
In 1839, while chaplain of the royal college in Rennes, he met Bishop Célestine Guynemer de la Hailandière of Vincennes, came to Indiana with him, and for six years was his vicar-general.
Bishop Martin left a collection of unpublished letters that tell the history of his diocese, his struggles with poverty, his many trips to France to recruit his clergy.
Cornelius Van De Ven, born at Oirschot, Holland, 16 June 1865, who studied in the diocesan seminary of Den Bosch, was ordained 31 May 1890, and came to America the same year.
The most important act of his administration has been the transferring of the see from the inaccessible town of Natchitoches to the progressive city of Alexandria, a railroad centre with a large Catholic population.