The fighting at Gainesville is often referred to in historical documents as the "Battle of Gainesville" and represented the first day of fighting in the Second Battle of Bull Run. Despite being outnumbered by more than 3-to-1, the brigade held their ground and the fighting ended indecisively around midnight. This is where the nickname "Iron Brigade" was first applied to their unit. The 2nd and 7th Wisconsin regiments took the bulk of the casualties in the battle, and all three field officers of the 7th, including Colonel Robinson, were wounded. The 2nd and 7th Wisconsin were temporarily consolidated under the command of Lt. Colonel Lucius Fairchild, who was one of the last-standing field officers of the two regiments.