My family is descended from the son of Agathe Wilms and Jean Baptiste Marchal (m. 1842).I have parental info for Agathe Wilms if it is interesting for you.
Their son Casimir Auguste Marchal (b. 1855) married Marie Louise Cleris in 1876 in New Orleans.I do not know when or under what circumstances Casimir Auguste immigrated to the US, but I would be interested in any info you may have (he must be Eusbe's brother).
Their son, Albert Auguste Marchal married Isabel Samuel and their son Henry Samuel Marchal is my grandfather (I am Henry Samuel Marchal, III).
My family still lives in New Orleans, but I am currently on assignment in Belgium.If you would like any info on this line, I can provide it to you (I use TMG).