flank/flanking to pass around the side of an enemy unit so as to attack behind the enemy's front line.
The Black Hats, Simon Cutler's Iron Brigade this reference is incorrect. The Black Hats or Iron Brigade was the First Brigade of I Corps' First Division. It was actually commanded by Brigadier General Solomon Meredith. Simon Cutler was most likely Lysander Cutler, who commanded that division's 2nd Brigade.
6th Wisconsin regiment that was part of the Iron Brigade and commanded by Major Rufus Dawes.
