(A) Antietam
(B) ** Fort Sumter
(C) Gettysburg
(D) Bull Run
EXPLANATIONS BELOW
Concept note-1: -The Battle of Fort Sumter (April 12–13, 1861) was the bombardment of Fort Sumter near Charleston, South Carolina by the South Carolina militia. It ended with the surrender by the United States Army, beginning the American Civil War.
Concept note-2: -At 4:30 a.m. on April 12, 1861, Confederate troops fired on Fort Sumter in South Carolina’s Charleston Harbor. Less than 34 hours later, Union forces surrendered. Traditionally, this event has been used to mark the beginning of the Civil War.
Concept note-3: -The bombardment of Fort Sumter would play a major part in triggering the Civil War. In the days following the assault, Lincoln issued a call for Union volunteers to quash the rebellion, while more Southern states including Virginia, North Carolina and Tennessee cast their lot with the Confederacy.
Concept note-4: -The Confederate victory at the Battle of Fort Sumter resulted in enormous support for military action from both the North and South. President Lincoln called for 75, 000 volunteers to put down the rebellion, while four more states joined the Confederacy.
Concept note-5: -The first land battle of the Civil War was fought on July 21, 1861, just 30 miles from Washington-close enough for U.S. senators to witness the battle in person. Southerners called it the Battle of Manassas, after the closest town. Northerners called it Bull Run, after a stream running through the battlefield.