It was the bloodiest day in America’s bloodiest war: September 17, 1862. Shortly after dawn, Confederate troops spied hazy blue figures emerging from a fog-enshrouded cornfield outside Sharpsburg, Maryland, and unleashed an artillery storm that mowed down dozens of Union soldiers within minutes.
http://www.history.com/news/7-ways-the-battle-of-antietam-changed-america
It wasn’t much of a military triumph for the Union, but the Battle of Antietam had enormous strategic implications. As a nine-day sesquicentennial commemoration begins at Antietam National Battlefield, explore seven ways that America’s bloodiest day changed the course of the Civil War—and the country itself. 1.
http://www.history.com/news/7-ways-the-battle-of-antietam-changed-america
Battle of Antietam, because it was a blood bath and it ended in a draw   The Battle of Gettysburg (May, 1863) proved to be the turning point of the Civil war. It marked th … e last major Confederate effort to shift the war northward onto Union soil.
http://www.answers.com/Q/What_was_the_turning_point_of_the_US_Civil_War
Gettysburg: First Day-McPherson's Ridge. Upon arriving in Gettysburg, Buford realized that the high ground south of the town would be critical in any battle fought in the area.
http://militaryhistory.about.com/od/civilwar/a/cwturningpts.htm
Answer. It is arguable as to what was the turning point of the American Civil War. The Battle of Gettysburg certainly is among the top three. My opinion is the Battle of Antietam was the foremost turning point. Lee's failure to achieve victory here ended the Confederate hope of European intervention on their behalf.
http://www.answers.com/Q/What_was_the_turning_point_of_the_US_Civil_War
Previous: War in the West, 1861-1863 | Civil War 101 | Next: War in the West, 1863-1865. Battle of Gettysburg: Union Order of Battle-Confederate Order of Battle. Gettysburg: Lee's Second Invasion of the North. Following his stunning victory at the Battle of Chancellorsville, Gen. Robert E. Lee decided to attempt a second invasion of the North.
http://militaryhistory.about.com/od/civilwar/a/cwturningpts.htm
The confederates made it as far as Gettysburg PA The answer to what event was the turning point of the Civil War is highly disputed amongst Civil War historians. Some say the Battle of Antietam, which occurred in Maryland, was one of the major Union victories in the Civil War.
http://www.answers.com/Q/What_was_the_turning_point_of_the_US_Civil_War
2. The battle allowed Abraham Lincoln to issue the Emancipation Proclamation. For two months, Lincoln’s order proclaiming the freedom of slaves in rebel territories had festered in a desk drawer, awaiting good news from the battlefield, lest it be seen as a desperate ploy.
http://www.history.com/news/7-ways-the-battle-of-antietam-changed-america
5. Photographs from Antietam brought the horror of war to Americans for the first time. Two days after the battle, photographer Alexander Gardner arrived at Antietam and became the first to snap images of an American battlefield strewn with the dead.
http://www.history.com/news/7-ways-the-battle-of-antietam-changed-america
On June 9, Union cavalry under Maj. Gen. Alfred Pleasonton surprised Maj. Gen. J.E.B. Stuart 's Confederate cavalry corps near Brandy Station, VA. In the largest cavalry battle of the war, Pleasanton's men fought the Confederates to a standstill, showing that they were finally the equals of their Southern counterparts.
http://militaryhistory.about.com/od/civilwar/a/cwturningpts.htm
which battle marked the turning point of the civil war?
The Battle of Gettysburg marked the turning point of the civil war. The Battle of Gettysburg marked the turning point of the civil war.  