In August 1862, the regiment was involved in Pope's Campaign in Northern Virginia and, just a year after the death of James Cameron at Bull Run, the regiment was once again fighting over the same battlefield. Manassas was once again to prove unlucky for the 79th as their colonel, Addison Farnsworth, also commanding the First Brigade, was wounded. Lt. Colonel Morrison, returning from a wound received at Seccessionville, was put in command of the brigade. At Chantilly on 1 September 1862, while approaching the crossroads of the Warrenton and Little River turnpikes, the Union forces collided with Stonewall Jackson's men who were formed in a line in front of Ox Hill facing southeast near Chantilly Mansion.