The battle cost more brutal than people expected
Because there were casualties up in the thousands. The public on both sides had dreamed of some brief, romantic war without casualties.
Because people got killed and wounded - the public on both sides had imagined it as a sort of theatrical parade, and this battle awakened them to the realities of war.
The first large battle of the US Civil War was fought
Nobody knows
At the immediate beginning of the Civil War in April of 1861, Southern troops occupied Charleston Harbor's Fort Sumter, which had been bombarded into submission. Soon after, more states seceded from the Union, troops were raised and trained by both sides, skirmishes took place between small contingents of civilians and troops, and then, on July 21st of 1861, the war's first large-scale battle took place, the First Battle of Bull Run (or, First Manassas).
The First Battle of Bull Run, or Manassas., on July 21, 1861, about twenty-five miles west of Washington DC. (The Union named Battles after the nearest body of water and the Confederates called the same Battles after the nearest town. A "Run" is a large creek in Virginia.) There was another large battle over this same ground in 1862. Both were Confederate victories.
The battle was more brutual than people expected
The battle was more brutual than people expected
The battle was more brutual than people expected
The battle was more brutual than people expected
The battle was more brutual than people expected
Because people got killed and wounded - the public on both sides had imagined it as a sort of theatrical parade, and this battle awakened them to the realities of war.
Because it was considered by both parties a bloodshed; the Union lost 481 dead and 1,011 wounded, the Confederate 387 dead and 1,582 wounded. But it was also shocking because they become aware that the war was going to be a long and costly one, and not a matter which would have been solved in a few months.
The first large battle of the US Civil War was fought
No. The battle that had the highest casualties for one day was Antietam. Gettysburg's 3-day battle was the bloodiest. Shiloh was the first large battle in Spring of 1862 with thousands of casualties. When people read about this, they realized the war would be long and very bloody.
The first Battle of Manassas or First Bull Run was the first large scale major action of the US Civil War. The first land battle however was the Battle of Philippi in what was then still Virginia. It was fought June 23, 1861. A naval bombardment of Confederate land artillery batteries by US Navy gunboats took place at Sewells Point, Virginia, May 18-19, 1861 making it the first battle of the war after Sumter.
Neither side was ready for operations, as demonstrated at the First Battle of bull Run. They still had to recruit, train and equip large armies.
That depends on which battle you are referring to. The very first "battle" was at Fort Sumter, which would just be a map showing the fort and the harbor. A few months later was the first major battle was called the first Battle of Bull Run, and was also known as the Battle of First Manassas by the confederate side. Several maps of that battle can be found on the First Battle of Bull Run page on Wikipedia (en.wikipedia.org/wiki/First_Battle_of_Bull_Run).