Which Federal Brigade suffered the most casualties (proportionately) at Antietam? An Imperfect Analysis

   Civil War arithmetic is never an exact science--let's get that out of the way first. Hence, the information below is likely an imperfect analysis of the posed question: which infantry brigade in the Army of the Potomac suffered, proportionately, the greatest number of casualties on September 17, 1862?

The attack of Fairchild's Brigade was sketched in the battle's aftermath