 After Antietam, the regiment's acting commander during the engagements at Second Manassas and Antietam, Lt. Col. Jacob Duryée, resigned after the Second's appointed commander, Thomas Allard, reported for duty.By this time, the regiment numbered less than 150 men out of the 900 that had left Baltimore less than a year earlier.The Second saw limited action at Fredericksburg, where they were held in reserve for most of the day before making a late assault on a stonewall at the base of Marye's Heights manned by Confederate forces.