Answer:
The First Battle of Bull Run, also known as the Battle of Manassas, marked the first major land battle of the American Civil War. ... The engagement began when about 35,000 Union troops marched from the federal capital in Washington, D.C. to strike a Confederate force of 20,000 along a small river known as Bull Run.
Step-by-step explanation:
Date: July 21, 1861
Result: Confederate victory