Russ:
My references are slim, but at the time of the Big Black River Bridge, the 11th was in Lawler's Brigade (2nd) with the 21st, 22nd and 23d IA, Col C.L. Harris, commanding. Lawler's was part of the 14th Division (BG Eugene A. Carr) of the XIII Corps under McClernand.
It is likely, but not necessarily so, that the same chain holds true for Bayou Cache, AR. Someone else will come along with better information tomorrow.
Welcome aboard, sir, and I hope you keep posting.
Ole |