Colonel Solomon Meredith: During the fight for Turner's Gap, Colonel Meredith commanded the 19th Indiana in Gibbon's "Iron Brigade". After his advance was stopped cold by two Confederate regiments, he send on company around the Confederate flank to fire upon their flank as he advanced his main line. The attack was successful and it forced the two Confederate regiments to retreat back up the mountain. He would be promoted to command of the Iron Brigade in October and he would lead it into Confederate onslaught on the first day of Gettysburg. His brigade would hold the line and pay a dear price for it in killed and wounded. During the fight, he would also be wounded.
Major General Henry Slocum: At South Mountain, he commanded a division within William Franklin's 6th Corps. His division would be the spearhead of the assault on Crampton's Gap. After a short fight with Confederates, his division charged up the mountain routing the Confederate defenders and capturing the gap. In October, he would be given command of the XII Corps, replacing Joseph K. Mansfield who had been killed at Antietam. He would commanded the corps in the Battle of Fredericksburg and at Chancellorsville he would command the right wing of Hooker's Army which included his corps and the two corps of General's Meade and Hooker. At Gettysburg, he would arrive with his corps at Gettysburg in the evening of July 1st and take up positions on the Union right flank. When Longstreet's assault crashed into the Union left flank and began pushing it back, Meade ordered Slocum to send his entire corps to reinforce the left. Slocum kept one brigade back, that of George S. Greene, and sent the remainder of the corps to the left. Greene's brigade would turn back Ewell's assault on Culp's Hill that night. His corps would return and reoccupy its position on July 3rd pushing out any remaining Confederates.