 By this time, the regiment had been reduced to roughly 750 men due to sickness over the course of the campaign and minor casualties in action.On June 25, 1862, McClellan ordered an ineffective offensive triggering the Seven Days Battles.On June 26, General Robert E. Lee, who had recently taken command of the Army of Northern Virginia, launched a daring counter-offensive intended to drive McClellan's army away from Richmond.