<em><u>Answer:</u></em>
a. Manassas
<em><u>Explanation:</u></em>
On July 21, 1861, Union and Confederate armed forces conflicted close Manassas Junction, Virginia, in the main real land skirmish of the American Civil War. Known as the First Battle of Bull Run or Manassas, the commitment started when around 35,000 Union troops walked from the government capital in Washington, D.C. to strike a Confederate power of 20,000 along a little waterway known as Bull Run. In the wake of battling on edge for the vast majority of the day, the revolutionaries mobilized and had the capacity to break the Union right flank, sending the Federals into a disordered retreat towards Washington. The Confederate triumph gave the South a flood of certainty and stunned numerous in the North, who understood the war would not be won as effectively as they had trusted.