battle of Antietam, and battle of Gettysburg, two significant details of each event?

Battle of Antietam:

1. It took place on September 17, 1862, near Sharpsburg, Maryland.
2. It was the bloodiest single day in American history, with over 23,000 casualties.

Battle of Gettysburg:
1. It took place from July 1-3, 1863, in Gettysburg, Pennsylvania.
2. It was the turning point of the Civil War, as the Union army defeated the Confederate army and halted their advance into the North.