Come up with a question and reasoning that would justify this answer: September 17 , 1862 , between Confederate General Robert E. Lee 's Army of Northern Virginia and Union General George B. McClellan 's Army of the Potomac , near Sharpsburg , Maryland and Antietam Creek as part of the Maryland Campaign
The question is: The Battle of Antietam / ntitm /, also known as the Battle of Sharpsburg, particularly in the Southern United States, was fought on September 17, 1862, between Confederate General Robert E. Lee's Army of Northern Virginia and Union General George B. McClellan's Army of the Potomac, near Sharpsburg, Maryland and Antietam Creek as part of the Maryland Campaign. It was the first field army -- level engagement in the Eastern Theater of the American Civil War to take place on Union soil and is the bloodiest single-day battle in American history, with a combined tally of 22,717 dead, wounded, or missing.

Answer this question based on the passage: when and where did the battle of antietam take place?
Step-by-step reasoning process: This is the relevant information: The Battle of Antietam / ntitm /, also known as the Battle of Sharpsburg, particularly in the Southern United States, was fought on September 17, 1862, between Confederate General Robert E. Lee's Army of Northern Virginia and Union General George B. McClellan's Army of the Potomac, near Sharpsburg, Maryland and Antietam Creek as part of the Maryland Campaign.