Which conflict is also known as the First Battle of Manassas?

The First Battle of Manassas, which took place on July 21, 1861, is indeed more commonly known as the Battle of Bull Run. This naming difference stems from the fact that the battle was fought near a small stream called Bull Run in Virginia, while Manassas is the name of the nearby town. The battle was significant as it was the first major battle of the American Civil War and showcased the unpreparedness of both armies, leading to a Confederate victory.

The significance of this battle lies not only in its immediate impact on the war's early dynamics but also in how it shaped public perception and expectations regarding the war's duration and the ferocity of the conflict. The Union defeat led to a reevaluation of military strategies and underlined the need for better training and preparedness. The other conflicts listed, such as Antietam, Gettysburg, and Vicksburg, refer to key battles in different contexts and stages of the Civil War and do not relate to the Battle of Bull Run.