Rhonda,

Conduct a Goggle Search - Yellow Jacket Battalion. Try first without quotes.

There is a lot of information to be found therein including a roster.

Also, this fellow is listed as an "Expert" on the regiment. He also has a website

18th Regiment Louisiana Infantry ideal21tc@home.com (J. Richard)
http://members.tripod.com/j_richard

I searched the available rosters found in these searches but do not find your man. However, he is recorded on CSR's in the Civil War Database.

Hopefully, J. Richards will be of assistance in your quest.

Happy Hunting,

George Martin