Question: What took place first, Battle of Antietam or Battle of Luzon?

Context paragraphs:
Crampton's Gap Historic District: The Crampton's Gap Historic District comprises the battlefield where the American Civil War Battle of Crampton's Gap, part of the larger Battle of South Mountain, took place on September 14, 1862.  The district extends on the west to the foot of South Mountain, and to the east of Burkittsville, beyond the eastern foot of the mountain.  The district is characterized by steep mountain terrain in the west and open farmland in the east, with the small town of Burkittsville in the center, which is itself listed as a historic district on the National Register of Historic Places.  The district extends to the south to include Brownsville Gap.  The district includes 98 contributing buildings, 78 of which are in the Burkittsville Historic District.  Crampton's Gap at the crest of the mountain is encompassed by Gathland State Park, which features the War Correspondents Memorial Arch, erected in 1896 to memorialize journalists killed in wartime.  The arch is listed on the National Register as part of Antietam National Battlefield.  The mountainous portions of the district feature numerous stone walls, which were used by both sides for shelter against gunfire during the battle.

Battle of Nablus (1918): The Battle of Nablus took place, together with the Battle of Sharon during the set piece Battle of Megiddo between 19 and 25 September 1918 in the last months of the Sinai and Palestine Campaign of the First World War.  Fighting took place in the Judean Hills where the British Empire's XX Corps attacked the Ottoman Empire's Yildirim Army Group's Seventh Army defending their line in front of Nablus.  This battle was also fought on the right flank in the Jordan Valley, where Chaytor's Force attacked and captured the Jordan River crossings, before attacking the Fourth Army at Es Salt and Amman capturing many thousands of prisoners and extensive territory.  The Battle of Nablus began half a day after the main Battle of Sharon, which was fought on the Mediterranean section of the front line where the XXI Corps attacked the Eighth Army defending the line in front of Tulkarm and Tabsor and the Desert Mounted Corps which rode north to capture the Esdrealon Plain.  Together these two battles, known as the Battle of Megiddo, began the Final Offensive of the war in the Sinai and Palestine campaign.

Battle of Antietam: The Battle of Antietam , also known as the Battle of Sharpsburg, particularly in the South, was fought on September 17, 1862, 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.

Battle of Baguio (1945): The Battle of Baguio occurred between 21 February and 26 April 1945, and was part of the greater Luzon campaign during the Allied liberation of the Philippines at the end of World War II.  During the battle, American and Philippine forces recaptured the city of Baguio on the island of Luzon from a Japanese occupation force.  One of the last tank engagements of the Philippine campaign took place during the battle.  Baguio later became the scene of the final surrender of Japanese forces in the Philippines in September 1945.

EBSA European Snooker Championships: The EBSA European Snooker Championships is the premier non-professional snooker tournament in Europe.  The event series is sanctioned by the European Billiards & Snooker Association.  It took place first in 1988 and is held annually since 1993.  In most years the winner of the tournament qualifies for the next two seasons of the World Snooker Tour.

Battle of Luzon: The Battle of Luzon, fought 9 January – 15 August 1945, was a land battle of the Pacific Theater of Operations of World War II by the Allied forces of the U.S., its colony the Philippines, and allies against forces of the Empire of Japan.  The battle resulted in a U.S. and Filipino victory.  The Allies had taken control of all strategically and economically important locations of Luzon by March 1945, although pockets of Japanese resistance held out in the mountains until the unconditional surrender of Japan.  While not the highest in U.S. casualties, it is the highest net casualty battle U.S. forces fought in World War II, with 192,000 to 205,000 Japanese combatants dead (mostly from starvation and disease), 10,000 American combatants killed, and between 120,000 to 140,000 Filipino civilians and combatants killed.

Back to Bataan: Back to Bataan is a 1945 World War II war film directed by Edward Dmytryk and starring John Wayne and Anthony Quinn.  It depicts events (some fictionalized and some actual) that took place after the Battle of Bataan (1941–42) on the island of Luzon in the Philippines.  The working title of the film was "The Invisible Army".

EBSA European Under-21 Snooker Championships: The EBSA European Under-21 Snooker Championships is the premier non-professional junior snooker tournament in Europe.  The event series is sanctioned by the European Billiards & Snooker Association.  It took place first in 1997 and is held annually since then.  The event was known as the EBSA European Under-19 Snooker Championships until 2010.  In most years the winner of the tournament qualifies for the next two seasons of the World Snooker Tour and well as being awarded the Ebdon Trophy which is named in honour of former World Champion Peter Ebdon.

First Transjordan attack on Amman: The First Transjordan attack on Amman (known to the British as the First Attack on Amman) and to their enemy as the First Battle of the Jordan took place between 21 March and 2 April 1918, as a consequence of the successful Battle of Tell 'Asur which occurred after the Capture of Jericho in February and the Occupation of the Jordan Valley began, during the Sinai and Palestine Campaign of World War I.  During the First Transjordan attack large incursions into Ottoman territory occurred.  Firstly the Passage of the Jordan River, was successfully captured between 21 and 23 March, followed by the first occupation of Es Salt in the hills of Moab between 24 and 25 March.  The First Battle of Amman took place between 27 and 31 March when the Anzac Mounted Division and the Imperial Camel Corps Brigade (fighting dismounted as infantry) were reinforced by two battalions of 181st Brigade followed by a second two battalions from the 180th Brigade (60th London Division) and artillery.  The Fourth Army headquarters located in Amman was strongly garrisoned and during the battle received reinforcements on the Hejaz railway, the strength of which eventually forced the attacking force to retire back to the Jordan Valley between 31 March and 2 April.  The Jordan Valley would continue to be occupied by the Egyptian Expeditionary Force (EEF) through the summer until the middle of September 1918 when the Battle of Megiddo began.

Texas Tech Shackleton Glacier Expedition: The Texas Tech Shackleton Glacier Expedition took place first from 1962/63 and then again from 1964/65.  The expedition, led by F. Alton Wade, was sponsored by Texas Technological College (now Texas Tech University).  It explored areas of Antarctica.

Supporting paragraphs: Battle of Antietam Battle of Luzon
Answer: Battle of Antietam