After destroying the Union army’s main supply depot at Manassas Junction on August 27, Confederate General Stonewall Jackson withdrew to a position behind an unfinished railroad cut just north of the battlefield of First Manassas to await an expected Federal counterattack. On the evening of August 28, Jackson attacked Northern troops that were marching east in front of his position to join the rest of the Union army. For over two hours, Union and Confederate soldiers engaged in savage fighting in an open field at point-blank range. Each side endured heavy casualties. One unit of Northern soldiers - men from Wisconsin and Indiana, many of whom had never seen combat before - would earn the nickname of the “Iron Brigade” for their tenacity in this fight. Although neither side could really claim victory that night, the brief battle attracted the attention of Union General John Pope, who believed that Jackson was retreating in confusion.