did a bit of web surfing to try and narrow down the possible units in or around the battle area. Per the following web site, the text shows the following Louisiana Units in or around the general area of the battle, on varying dates around the battle:
1. On the 10th the Louisiana Zouaves, under Lieutenant-Colonel Coppens, were ordered from Richmond to Yorktown,
2. A Louisiana infantry regiment (possibly the 2nd, per Bergeronís Book) arrived after the battle was over, but returned to Yorktown the same night, marching 28 miles during the day, as it was not thought prudent to leave Yorktown exposed without troops.
3. Colonel Magruder reported on the 18th, from Bethel church, that he then occupied that post with the Second Louisiana,
4. About midnight of July 4th, Lieut.-Col. Charles D. Dreux, of the First Louisiana battalion, led a detachment of 150 infantry, 1 howitzer and about 15 or 20 cavalry, in an advance in the direction of Newport News
Well, perhaps narrows it down to about 2000 names to search through.