(A) Greenhow succeeded in informing the South of the impending attack.
(B) ** Greenhow succeeded in informing the South of the impending attack, the Union was very loud in their march, and they had many troops protecting the capital.
(C) The South could hear them coming.
(D) The South had a large army surrounding their capital
EXPLANATIONS BELOW
Concept note-1: -The battle came about when President Lincoln ordered General Irvin McDowell to strike Confederate forces at Manassas Junction, as a step toward taking Richmond. He wanted to move quickly against the enemy, hoping a decisive victory would quell the rebellion.
Concept note-2: -On July 21, 1861, in the first major land battle of the Civil War, a large Union force under General Irvin McDowell is routed by a Confederate army under General Pierre G.T. Beauregard.
Concept note-3: -The outcome was significant because it shocked many people, including Northern politicians, who believed the conflict between the North and South would be short-lived. It also provided Southern forces with confidence they could hold their own with the Northern army.