I posed this question: "A soldier from which Iron Brigade regiment captured Confederate Brig. Gen. James Archer on July 1, 1863?" The answer was the 2nd Wisconsin, which most people answered correctly.
The Iron Brigade is not a unit I have read all that much about except for In the Bloody Railroad Cut, by Lance Herdegen and William J.K. Beaudot (which covers only the 6th Wisconsin while lightly touching the other regiments), or the occasional piece in Gettysburg Magazine.
Stay tuned for an update on a new book we have coming out October 1 by Lance Herdegen called "Those Damn Black Hats!" The Iron Brigade in the Gettysburg Campaign. Lance's new book is difficult to pigeon hole. Suffice it to say that it is military and social history at its finest, with dozens of previously unpublished photos and sources that help flesh out the Westerners' "finest hours."