Answer:
The correct answer is D. As result of the First Battle of Bull Run, both armies realized the war would be prolonged and costly.
Explanation:
The first Battle of Bull Run was fought during the Civil War on the banks of the Bull Run River in Virginia on July 21, 1861, when the Southern Army of 32,000 men won a complete victory over the northern states' 35,000 soldiers. Both sides were poorly led, resulting in amateurish confrontations and incomplete maneuvers. During the battle, the Union was on its head for a long time, but the progress of the troops stopped on Henry House Hill. At Henry House Hill, Confederate troops received reinforcements with the help of Confederate Commander P. G. T. Beauregard. In a counterattack, Confederate forces succeeded in breaking the Union defensive line, causing Union soldiers to panic and uncontrolled retreat toward Washington.
A year later, in August 1862, another Battle of Bull Run was fought in the same area. That, too, ended in a defeat for the Union, though not as heavy.
The victory of the southern states resulted in a self-assurance that lasted until the battle of Gettysburg
