Ed --

Here's the standard regimental history of the 11th Mississippi Regiment. The fighting mentioned is the Battle of Gaines Mill VA, June 27, 1862. During most of the year this regiment served in Col Evander M Law's Brigade, Whiting's (later Hood's) Division.
http://www.mississippiscv.org/MS_Units/11th_MS_Inf.htm

This website includes a map showing the attack of the 11th Mississippi along Beaverdam Creek --
http://www.saverichmondbattlefields.org/gainesmill.htm

It's been long years since I owned that book, but Burke Davis should mention that Whiting's Division joined Jackson shortly before Jackson's command arrived in camp near Richmond.