user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: What was the location of the Battle of Antietam? 
Knowledge Triplets: 14th Louisiana Infantry Regiment, base.americancivilwar.military_unit.conflicts_participated_in, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Elisha F. Paxton
Stonewall Jackson, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Maxcy Gregg
Thomas Francis Meagher, military.military_person.participated_in_conflicts, American Civil War
D. Wyatt Aiken, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, common.topic.notable_types, Military Conflict
Battle of Antietam, military.military_conflict.military_personnel_involved, Henry Baxter
Battle of Antietam, military.military_conflict.military_personnel_involved, Edward Lloyd Thomas
George Sykes, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, George B. McClellan
Battle of Antietam, military.military_conflict.military_personnel_involved, Daniel Butterfield
John Bell Hood, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Nelson A. Miles
Charles Albright, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Joseph K. Mansfield
Maryland Campaign, military.military_conflict.military_personnel_involved, George B. McClellan
Ambrose Burnside, military.military_person.participated_in_conflicts, Maryland Campaign
Battle of Antietam, military.military_conflict.military_personnel_involved, George Meade
Battle of Antietam, location.location.events, Sharpsburg
American Civil War, common.topic.notable_types, Military Conflict
Battle of Antietam, military.military_conflict.military_personnel_involved, Jacob Dolson Cox
William Dorsey Pender, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Samuel D. Sturgis
Richard B. Garnett, military.military_person.participated_in_conflicts, American Civil War
George T. Anderson, military.military_person.participated_in_conflicts, Battle of Antietam
Maryland, location.location.events, Maryland Campaign
Battle of Antietam, military.military_conflict.military_personnel_involved, David Lang
Battle of Antietam, military.military_conflict.military_personnel_involved, Solomon Meredith
John C. Caldwell, military.military_person.participated_in_conflicts, American Civil War
m.04fvfz1, military.military_combatant_group.conflict, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Thomas H. Ruger
Battle of Antietam, military.military_conflict.combatants, m.04fvfz1
David Lang, military.military_person.participated_in_conflicts, American Civil War
15th Louisiana Infantry Regiment, base.americancivilwar.military_unit.conflicts_participated_in, Battle of Antietam
Robert E. Rodes, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Daniel Harvey Hill
Samuel D. Sturgis, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, William Farrar Smith
Battle of Antietam, military.military_conflict.military_personnel_involved, William Dorsey Pender
Sharpsburg, location.location.events, Battle of Antietam
Winfield S. Featherston, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Nathan George Evans
Battle of Antietam, base.culturalevent.event.entity_involved, George B. McClellan
Battle of Antietam, military.military_conflict.military_personnel_involved, Alfred Iverson, Jr.
Battle of Antietam, military.military_conflict.commanders, m.049y3bl
William T. Wofford, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Roger Atkinson Pryor
m.049y3bc, military.military_command.military_commander, George B. McClellan
George P. Doles, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, book.book_subject.works, Crossroads of Freedom: Antietam, The Battle that Changed the Course of the Civil War
Battle of Antietam, base.americancivilwar.battle.military_units_involved_in_this_conflict, 14th Louisiana Infantry Regiment
Ranald S. Mackenzie, military.military_person.participated_in_conflicts, Battle of Antietam
2nd Louisiana Infantry Regiment, base.americancivilwar.military_unit.conflicts_participated_in, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, George B. Anderson
Battle of Antietam, common.topic.article, m.0lkxl
Battle of Antietam, military.military_conflict.military_personnel_involved, Charles Griffin
Battle of Antietam, time.event.locations, Sharpsburg
Battle of Antietam, military.military_conflict.military_personnel_involved, Truman Seymour
George S. Greene, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Stonewall Jackson
Henry Baxter, military.military_person.participated_in_conflicts, Battle of Antietam
Nelson A. Miles, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Thomas Francis Meagher
Battle of Antietam, military.military_conflict.military_personnel_involved, Harry T. Hays
Battle of Antietam, military.military_conflict.military_personnel_involved, Richard B. Garnett
Evander M. Law, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Evander M. Law
Battle of Antietam, military.military_conflict.military_personnel_involved, James B. Ricketts
William Smith, military.military_person.participated_in_conflicts, American Civil War
Daniel Butterfield, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, William E. Starke
Ranald S. Mackenzie, military.military_person.participated_in_conflicts, American Civil War
James B. Ricketts, military.military_person.participated_in_conflicts, Battle of Antietam
Crossroads of Freedom: Antietam, The Battle that Changed the Course of the Civil War, book.written_work.subjects, American Civil War
James A. Walker, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, base.culturalevent.event.entity_involved, Union
Battle of Antietam by Thulstrup, common.image.size, m.02gnqv5
Battle of Antietam, military.military_conflict.military_personnel_involved, Bryan Grimes
Battle of Antietam, military.military_conflict.military_personnel_involved, Joseph Hooker
Joseph K. Mansfield, people.deceased_person.place_of_death, Sharpsburg
William E. Starke, military.military_person.participated_in_conflicts, Battle of Antietam
Nathan Kimball, military.military_person.participated_in_conflicts, Battle of Antietam
Robert Ransom, Jr., military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, common.topic.notable_for, g.12558rr3p
Alfred Iverson, Jr., military.military_person.participated_in_conflicts, American Civil War
George T. Anderson, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Albion P. Howe
Jubal Early, military.military_person.participated_in_conflicts, American Civil War
Lawrence O'Bryan Branch, people.deceased_person.place_of_death, Sharpsburg
Nathan George Evans, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, time.event.included_in_event, Maryland Campaign
Battle of Antietam, military.military_conflict.military_personnel_involved, James Henry Lane
Battle of Antietam, military.military_conflict.military_personnel_involved, Thomas Drayton
Battle of Antietam, common.topic.image, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Ambrose R. Wright
Stonewall Jackson, military.military_person.participated_in_conflicts, Maryland Campaign
Battle of Antietam, military.military_conflict.military_personnel_involved, David Rumph Jones
Battle of Antietam, military.military_conflict.military_personnel_involved, George Sykes
Jacob Dolson Cox, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam2, common.image.appears_in_topic_gallery, Battle of Antietam
Alfred Iverson, Jr., military.military_person.participated_in_conflicts, Battle of Antietam
Francis C. Barlow, military.military_person.participated_in_conflicts, Battle of Antietam
George B. Anderson, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, William Harrow
Lafayette McLaws, military.military_person.participated_in_conflicts, Battle of Antietam
William Barksdale, military.military_person.participated_in_conflicts, American Civil War
Oliver O. Howard, military.military_person.participated_in_conflicts, Battle of Antietam
Crossroads of Freedom: Antietam, The Battle that Changed the Course of the Civil War, book.written_work.subjects, Battle of Antietam
Fitz John Porter, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, William Smith
Lucius Fairchild, military.military_person.participated_in_conflicts, Battle of Antietam
Truman Seymour, military.military_person.participated_in_conflicts, American Civil War
Solomon Meredith, military.military_person.participated_in_conflicts, American Civil War
George P. Doles, military.military_person.participated_in_conflicts, Battle of Antietam
m.049y3bc, military.military_command.military_conflict, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Lucius Fairchild
Battle of Antietam, military.military_conflict.military_personnel_involved, Edward E. Cross
George B. Anderson, military.military_person.participated_in_conflicts, American Civil War
Robert E. Lee, military.military_person.participated_in_conflicts, American Civil War
David Lang, military.military_person.participated_in_conflicts, Battle of Antietam
Daniel Butterfield, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, George Armstrong Custer
William Farrar Smith, military.military_person.participated_in_conflicts, American Civil War
Edward Lloyd Thomas, military.military_person.participated_in_conflicts, American Civil War
Joseph K. Mansfield, military.military_person.participated_in_conflicts, Battle of Antietam
George Meade, military.military_person.participated_in_conflicts, Battle of Antietam
John Bell Hood, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Andrew A. Humphreys
William Harrow, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Fitz John Porter
Battle of Antietam, military.military_conflict.military_personnel_involved, John Brown Gordon
Alexander Lawton, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Oliver O. Howard
Sharpsburg, location.hud_county_place.place, Sharpsburg
Battle of Antietam, military.military_conflict.military_personnel_involved, Charles Albright
Battle of Antietam, time.event.included_in_event, American Civil War
Battle of Antietam, common.topic.image, Battle of Antietam2
Battle of Antietam, military.military_conflict.combatants, m.049y38h
Battle of Antietam, base.americancivilwar.battle.military_units_involved_in_this_conflict, 10th Louisiana Infantry
Battle of Antietam, military.military_conflict.military_personnel_involved, D. Wyatt Aiken
Albion P. Howe, military.military_person.participated_in_conflicts, Battle of Antietam
m.049y3bl, military.military_command.military_conflict, Battle of Antietam
George Sykes, military.military_person.participated_in_conflicts, American Civil War
Israel B. Richardson, people.deceased_person.place_of_death, Sharpsburg
Maxcy Gregg, military.military_person.participated_in_conflicts, American Civil War
Edward Lloyd Thomas, military.military_person.participated_in_conflicts, Battle of Antietam
William T. Wofford, military.military_person.participated_in_conflicts, American Civil War
Henry Warner Slocum, military.military_person.participated_in_conflicts, American Civil War
Evander M. Law, military.military_person.participated_in_conflicts, Battle of Antietam
Samuel D. Sturgis, military.military_person.participated_in_conflicts, American Civil War
Nathan George Evans, military.military_person.participated_in_conflicts, American Civil War
Francis C. Barlow, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, John C. Caldwell
Fitz John Porter, military.military_person.participated_in_conflicts, American Civil War
Elisha F. Paxton, military.military_person.participated_in_conflicts, American Civil War
Roger Atkinson Pryor, military.military_person.participated_in_conflicts, American Civil War
Paul Jones Semmes, military.military_person.participated_in_conflicts, Battle of Antietam
Sharpsburg, location.location.containedby, Maryland
Battle of Antietam, military.military_conflict.military_personnel_involved, Lawrence O'Bryan Branch
John Pelham, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, George T. Anderson
Battle of Antietam, military.military_conflict.military_personnel_involved, George P. Doles
Battle of Antietam, military.military_conflict.military_personnel_involved, Jubal Early
Nathan Kimball, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Nathan Kimball
Lawrence O'Bryan Branch, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Benjamin G. Humphreys
John Brown Gordon, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.combatants, m.049y38p
Thomas H. Ruger, military.military_person.participated_in_conflicts, Battle of Antietam
Maryland Campaign, common.topic.notable_types, Military Conflict
Maryland Campaign, time.event.included_in_event, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, George S. Greene
Robert Ransom, Jr., military.military_person.participated_in_conflicts, American Civil War
Elisha F. Paxton, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, William Barksdale
James A. Walker, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, William T. Wofford
Edward E. Cross, military.military_person.participated_in_conflicts, Battle of Antietam
George Armstrong Custer, military.military_person.participated_in_conflicts, American Civil War
David Rumph Jones, military.military_person.participated_in_conflicts, Battle of Antietam
James Henry Lane, military.military_person.participated_in_conflicts, Battle of Antietam
Robert E. Lee, military.military_commander.military_commands, m.049y3bl
Charles Albright, military.military_person.participated_in_conflicts, Battle of Antietam
Alexander Lawton, military.military_person.participated_in_conflicts, American Civil War
Charles Griffin, military.military_person.participated_in_conflicts, American Civil War
Andrew A. Humphreys, military.military_person.participated_in_conflicts, American Civil War
James L. Kemper, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, John Bell Hood
Andrew A. Humphreys, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Israel B. Richardson
Battle of Antietam, military.military_conflict.military_personnel_involved, William Ruffin Cox
Battle of Antietam, military.military_conflict.military_personnel_involved, Paul Jones Semmes
Battle of Antietam, military.military_conflict.military_personnel_involved, Winfield S. Featherston
John Newton, military.military_person.participated_in_conflicts, Battle of Antietam
George B. McClellan, military.military_commander.military_commands, m.049y3bc
Battle of Antietam, base.schemastaging.context_name.pronunciation, g.125_rb17b
Battle of Antietam, common.image.appears_in_topic_gallery, Battle of Antietam
Ambrose Burnside, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Alexander Lawton
Maryland Campaign, military.military_conflict.military_personnel_involved, Ambrose Burnside
Truman Seymour, military.military_person.participated_in_conflicts, Battle of Antietam
Ambrose R. Wright, military.military_person.participated_in_conflicts, Battle of Antietam
Thomas H. Ruger, military.military_person.participated_in_conflicts, American Civil War
D. Wyatt Aiken, military.military_person.participated_in_conflicts, Battle of Antietam
Maryland Campaign, time.event.includes_event, Battle of Antietam
Jacob Dolson Cox, military.military_person.participated_in_conflicts, Battle of Antietam
m.04fvfz1, military.military_combatant_group.combatants, Union
Battle of Antietam, base.americancivilwar.battle.military_units_involved_in_this_conflict, 15th Louisiana Infantry Regiment
Battle of Antietam, military.military_conflict.military_personnel_involved, Ambrose Burnside
Bryan Grimes, military.military_person.participated_in_conflicts, American Civil War
Thomas Drayton, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, John Newton
Battle of Antietam, military.military_conflict.military_personnel_involved, John Pelham
Battle of Antietam, military.military_conflict.commanders, m.049y3bc
Winfield S. Featherston, military.military_person.participated_in_conflicts, American Civil War
Jubal Early, military.military_person.participated_in_conflicts, Battle of Antietam
James Henry Lane, military.military_person.participated_in_conflicts, American Civil War
Lafayette McLaws, military.military_person.participated_in_conflicts, American Civil War
George Armstrong Custer, military.military_person.participated_in_conflicts, Battle of Antietam
Joseph Hooker, military.military_person.participated_in_conflicts, American Civil War
William E. Starke, military.military_person.participated_in_conflicts, American Civil War
Thomas Drayton, military.military_person.participated_in_conflicts, American Civil War
Paul Jones Semmes, military.military_person.participated_in_conflicts, American Civil War
William Lowther \"Mudwall\" Jackson, military.military_person.participated_in_conflicts, American Civil War
William Ruffin Cox, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam by Thulstrup, common.image.appears_in_topic_gallery, Battle of Antietam
Alpheus S. Williams, military.military_person.participated_in_conflicts, Battle of Antietam
Ambrose R. Wright, military.military_person.participated_in_conflicts, American Civil War
William Smith, military.military_person.participated_in_conflicts, Battle of Antietam
John Pelham, military.military_person.participated_in_conflicts, Battle of Antietam
Harry T. Hays, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Henry Warner Slocum
Battle of Antietam, time.event.locations, Maryland
George B. McClellan, military.military_person.participated_in_conflicts, Maryland Campaign
m.049y38h, military.military_combatant_group.conflict, Battle of Antietam
American Civil War, base.culturalevent.event.entity_involved, Robert E. Lee
Battle of Antietam, base.americancivilwar.battle.military_units_involved_in_this_conflict, 2nd Louisiana Infantry Regiment
Lucius Fairchild, military.military_person.participated_in_conflicts, American Civil War
George B. McClellan, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, William Lowther \"Mudwall\" Jackson
Edward E. Cross, military.military_person.participated_in_conflicts, American Civil War
Benjamin G. Humphreys, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, common.topic.image, Battle of Antietam by Thulstrup
Daniel Harvey Hill, military.military_person.participated_in_conflicts, Battle of Antietam
Robert E. Rodes, military.military_person.participated_in_conflicts, Battle of Antietam
Charles Griffin, military.military_person.participated_in_conflicts, Battle of Antietam
Roger Atkinson Pryor, military.military_person.participated_in_conflicts, Battle of Antietam
Henry Baxter, military.military_person.participated_in_conflicts, American Civil War
Benjamin G. Humphreys, military.military_person.participated_in_conflicts, American Civil War
Bryan Grimes, military.military_person.participated_in_conflicts, Battle of Antietam
Harry T. Hays, military.military_person.participated_in_conflicts, American Civil War
10th Louisiana Infantry, base.americancivilwar.military_unit.conflicts_participated_in, Battle of Antietam
Ambrose Burnside, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, base.culturalevent.event.entity_involved, Robert E. Lee
Maryland, location.location.events, Battle of Antietam
Maxcy Gregg, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, James L. Kemper
Stonewall Jackson, military.military_person.participated_in_conflicts, Battle of Antietam
John C. Caldwell, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Robert E. Rodes
American Civil War, base.culturalevent.event.entity_involved, George B. McClellan
George S. Greene, military.military_person.participated_in_conflicts, American Civil War
Thomas Francis Meagher, military.military_person.participated_in_conflicts, Battle of Antietam
Joseph Hooker, military.military_person.participated_in_conflicts, Battle of Antietam
George Meade, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Alpheus S. Williams
William Farrar Smith, military.military_person.participated_in_conflicts, Battle of Antietam
m.049y3bl, military.military_command.military_commander, Robert E. Lee
Israel B. Richardson, military.military_person.participated_in_conflicts, Battle of Antietam
John Newton, military.military_person.participated_in_conflicts, American Civil War
George B. McClellan, military.military_person.participated_in_conflicts, Battle of Antietam
David Rumph Jones, military.military_person.participated_in_conflicts, American Civil War
William Harrow, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam by Thulstrup, common.image.appears_in_topic_gallery, Battle of Antietam
Nelson A. Miles, military.military_person.participated_in_conflicts, Battle of Antietam
Solomon Meredith, military.military_person.participated_in_conflicts, Battle of Antietam
William Barksdale, military.military_person.participated_in_conflicts, Battle of Antietam
Israel B. Richardson, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Ranald S. Mackenzie
Alpheus S. Williams, military.military_person.participated_in_conflicts, American Civil War
Maryland Campaign, military.military_conflict.military_personnel_involved, Stonewall Jackson
m.049y38p, military.military_combatant_group.conflict, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, James A. Walker
Battle of Antietam, military.military_conflict.military_personnel_involved, Francis C. Barlow
Battle of Antietam, military.military_conflict.military_personnel_involved, Robert Ransom, Jr.
William Ruffin Cox, military.military_person.participated_in_conflicts, American Civil War
Albion P. Howe, military.military_person.participated_in_conflicts, American Civil War
Maryland Campaign, time.event.locations, Maryland
Battle of Antietam, military.military_conflict.military_personnel_involved, Lafayette McLaws
James L. Kemper, military.military_person.participated_in_conflicts, American Civil War
Joseph K. Mansfield, military.military_person.participated_in_conflicts, American Civil War
Henry Warner Slocum, military.military_person.participated_in_conflicts, Battle of Antietam
Oliver O. Howard, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, time.event.locations, Maryland
Richard B. Garnett, military.military_person.participated_in_conflicts, Battle of Antietam
Daniel Harvey Hill, military.military_person.participated_in_conflicts, American Civil War
William Lowther \"Mudwall\" Jackson, military.military_person.participated_in_conflicts, Battle of Antietam

Answer: Maryland
Sharpsburg