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 is the subject of the image, "Battle of Antietam by Thulstrup creek"? 
Knowledge Triplets: Battle of Antietam, military.military_conflict.military_personnel_involved, Truman Seymour
David Rumph Jones, military.military_person.participated_in_conflicts, American Civil War
James A. Walker, military.military_person.participated_in_conflicts, American Civil War
George B. McClellan, military.military_person.participated_in_conflicts, Maryland Campaign
Andrew A. Humphreys, military.military_person.participated_in_conflicts, Battle of Antietam
William T. Wofford, military.military_person.participated_in_conflicts, Battle of Antietam
Sharpsburg, location.hud_county_place.place, Sharpsburg
William Dorsey Pender, military.military_person.participated_in_conflicts, Battle of Antietam
Maryland Campaign, time.event.locations, Maryland
Battle of Antietam, military.military_conflict.military_personnel_involved, Ambrose R. Wright
James B. Ricketts, military.military_person.participated_in_conflicts, Battle of Antietam
Henry Warner Slocum, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Daniel Butterfield
George S. Greene, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Paul Jones Semmes
Joseph K. Mansfield, military.military_person.participated_in_conflicts, American Civil War
Daniel Butterfield, military.military_person.participated_in_conflicts, American Civil War
Lafayette McLaws, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, George P. Doles
William T. Wofford, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, George T. Anderson
George B. McClellan, military.military_person.participated_in_conflicts, American Civil War
Henry Baxter, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, time.event.included_in_event, American Civil War
John Newton, military.military_person.participated_in_conflicts, American Civil War
American Civil War, base.culturalevent.event.entity_involved, Robert E. Lee
Charles Griffin, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, James A. Walker
Battle of Antietam, military.military_conflict.military_personnel_involved, Joseph K. Mansfield
Battle of Antietam, military.military_conflict.military_personnel_involved, Maxcy Gregg
Benjamin G. Humphreys, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, George B. Anderson
Robert Ransom, Jr., military.military_person.participated_in_conflicts, Battle of Antietam
Francis C. Barlow, military.military_person.participated_in_conflicts, American Civil War
Maryland Campaign, common.topic.notable_types, Military Conflict
John Pelham, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Henry Warner Slocum
Battle of Antietam2, common.image.appears_in_topic_gallery, Battle of Antietam
George Sykes, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, William Lowther \"Mudwall\" Jackson
George Armstrong Custer, military.military_person.participated_in_conflicts, Battle of Antietam
Bryan Grimes, 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, John C. Caldwell
George B. Anderson, military.military_person.participated_in_conflicts, Battle of Antietam
Henry Warner Slocum, military.military_person.participated_in_conflicts, Battle of Antietam
William Smith, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, William Smith
Jubal Early, military.military_person.participated_in_conflicts, American Civil War
m.049y38p, military.military_combatant_group.conflict, Battle of Antietam
Joseph Hooker, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, common.topic.image, Battle of Antietam by Thulstrup
Battle of Antietam, military.military_conflict.military_personnel_involved, David Rumph Jones
Battle of Antietam, military.military_conflict.military_personnel_involved, William Harrow
Harry T. Hays, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, William Barksdale
Battle of Antietam, military.military_conflict.military_personnel_involved, D. Wyatt Aiken
Battle of Antietam, military.military_conflict.military_personnel_involved, Elisha F. Paxton
Jubal Early, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Henry Baxter
Stonewall Jackson, military.military_person.participated_in_conflicts, American Civil War
George B. Anderson, military.military_person.participated_in_conflicts, American Civil War
John Newton, military.military_person.participated_in_conflicts, Battle of Antietam
David Lang, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, base.americancivilwar.battle.military_units_involved_in_this_conflict, 10th Louisiana Infantry
Stonewall Jackson, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Harry T. Hays
Francis C. Barlow, military.military_person.participated_in_conflicts, Battle of Antietam
Edward Lloyd Thomas, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Evander M. Law
William Ruffin Cox, military.military_person.participated_in_conflicts, Battle of Antietam
John Brown Gordon, military.military_person.participated_in_conflicts, Battle of Antietam
William Harrow, military.military_person.participated_in_conflicts, American Civil War
Albion P. Howe, military.military_person.participated_in_conflicts, American Civil War
John Bell Hood, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam by Thulstrup, common.image.appears_in_topic_gallery, Battle of Antietam
m.049y38h, military.military_combatant_group.conflict, Battle of Antietam
Battle of Antietam, military.military_conflict.combatants, m.04fvfz1
Maryland Campaign, time.event.includes_event, Battle of Antietam
Ambrose R. Wright, military.military_person.participated_in_conflicts, Battle of Antietam
William Barksdale, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, base.culturalevent.event.entity_involved, Union
Battle of Antietam, military.military_conflict.military_personnel_involved, Lucius Fairchild
Battle of Antietam, military.military_conflict.combatants, m.049y38p
Alexander Lawton, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Joseph Hooker
Maryland, location.location.events, Maryland Campaign
Lucius Fairchild, military.military_person.participated_in_conflicts, American Civil War
American Civil War, common.topic.notable_types, Military Conflict
D. Wyatt Aiken, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam by Thulstrup, common.image.size, m.02gnqv5
Daniel Harvey Hill, military.military_person.participated_in_conflicts, Battle of Antietam
William Lowther \"Mudwall\" Jackson, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, time.event.locations, Sharpsburg
Fitz John Porter, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Solomon Meredith
Thomas H. Ruger, military.military_person.participated_in_conflicts, American Civil War
m.04fvfz1, military.military_combatant_group.combatants, Union
Joseph K. Mansfield, people.deceased_person.place_of_death, Sharpsburg
Battle of Antietam, book.book_subject.works, Crossroads of Freedom: Antietam, The Battle that Changed the Course of the Civil War
m.049y3bc, military.military_command.military_conflict, Battle of Antietam
Robert E. Rodes, military.military_person.participated_in_conflicts, Battle of Antietam
Maxcy Gregg, military.military_person.participated_in_conflicts, Battle of Antietam
Maryland Campaign, military.military_conflict.military_personnel_involved, Ambrose Burnside
David Lang, military.military_person.participated_in_conflicts, Battle of Antietam
Nathan Kimball, military.military_person.participated_in_conflicts, Battle of Antietam
John C. Caldwell, military.military_person.participated_in_conflicts, Battle of Antietam
Robert E. Rodes, military.military_person.participated_in_conflicts, American Civil War
Alfred Iverson, Jr., military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Jacob Dolson Cox
Battle of Antietam, military.military_conflict.military_personnel_involved, Oliver O. Howard
William Farrar Smith, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, John Brown Gordon
Battle of Antietam, military.military_conflict.military_personnel_involved, David Lang
Battle of Antietam, base.schemastaging.context_name.pronunciation, g.125_rb17b
James L. Kemper, military.military_person.participated_in_conflicts, Battle of Antietam
George Sykes, military.military_person.participated_in_conflicts, Battle of Antietam
George B. McClellan, military.military_commander.military_commands, m.049y3bc
William Smith, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, John Pelham
m.049y3bl, military.military_command.military_commander, Robert E. Lee
Winfield S. Featherston, military.military_person.participated_in_conflicts, American Civil War
14th Louisiana Infantry Regiment, base.americancivilwar.military_unit.conflicts_participated_in, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Nathan Kimball
Thomas Francis Meagher, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, James B. Ricketts
Battle of Antietam, military.military_conflict.military_personnel_involved, Andrew A. Humphreys
Daniel Butterfield, military.military_person.participated_in_conflicts, Battle of Antietam
Ranald S. Mackenzie, military.military_person.participated_in_conflicts, Battle of Antietam
Roger Atkinson Pryor, military.military_person.participated_in_conflicts, Battle of Antietam
Lawrence O'Bryan Branch, people.deceased_person.place_of_death, Sharpsburg
Battle of Antietam, base.americancivilwar.battle.military_units_involved_in_this_conflict, 15th Louisiana Infantry Regiment
Oliver O. Howard, military.military_person.participated_in_conflicts, American Civil War
Lafayette McLaws, military.military_person.participated_in_conflicts, Battle of Antietam
Nelson A. Miles, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Ambrose Burnside
10th Louisiana Infantry, base.americancivilwar.military_unit.conflicts_participated_in, Battle of Antietam
Sharpsburg, location.location.events, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Benjamin G. Humphreys
Evander M. Law, 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, Stonewall Jackson
Battle of Antietam, military.military_conflict.military_personnel_involved, Charles Albright
Battle of Antietam, military.military_conflict.military_personnel_involved, Alexander Lawton
m.049y3bc, military.military_command.military_commander, George B. McClellan
Samuel D. Sturgis, military.military_person.participated_in_conflicts, American Civil War
Bryan Grimes, military.military_person.participated_in_conflicts, Battle of Antietam
William Ruffin Cox, military.military_person.participated_in_conflicts, American Civil War
Oliver O. Howard, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, common.topic.image, Battle of Antietam2
William E. Starke, military.military_person.participated_in_conflicts, American Civil War
John C. Caldwell, military.military_person.participated_in_conflicts, American Civil War
Charles Albright, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Richard B. Garnett
Paul Jones Semmes, military.military_person.participated_in_conflicts, American Civil War
Thomas Francis Meagher, military.military_person.participated_in_conflicts, American Civil War
Alexander Lawton, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Edward Lloyd Thomas
Crossroads of Freedom: Antietam, The Battle that Changed the Course of the Civil War, book.written_work.subjects, Battle of Antietam
David Rumph Jones, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Robert E. Rodes
Alpheus S. Williams, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Bryan Grimes
Alpheus S. Williams, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Ranald S. Mackenzie
m.049y3bl, military.military_command.military_conflict, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Lawrence O'Bryan Branch
James Henry Lane, military.military_person.participated_in_conflicts, American Civil War
Ambrose R. Wright, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, William Ruffin Cox
Truman Seymour, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Lafayette McLaws
Battle of Antietam, military.military_conflict.military_personnel_involved, Samuel D. Sturgis
Battle of Antietam, time.event.locations, Maryland
2nd Louisiana Infantry Regiment, base.americancivilwar.military_unit.conflicts_participated_in, Battle of Antietam
Israel B. Richardson, military.military_person.participated_in_conflicts, American Civil War
Israel B. Richardson, people.deceased_person.place_of_death, Sharpsburg
William Farrar Smith, military.military_person.participated_in_conflicts, Battle of Antietam
Thomas Drayton, military.military_person.participated_in_conflicts, American Civil War
Maryland Campaign, time.event.included_in_event, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Alpheus S. Williams
Battle of Antietam, base.americancivilwar.battle.military_units_involved_in_this_conflict, 14th Louisiana Infantry Regiment
Edward Lloyd Thomas, military.military_person.participated_in_conflicts, Battle of Antietam
Thomas H. Ruger, military.military_person.participated_in_conflicts, Battle of Antietam
Edward E. Cross, military.military_person.participated_in_conflicts, American Civil War
Samuel D. Sturgis, military.military_person.participated_in_conflicts, Battle of Antietam
Andrew A. Humphreys, military.military_person.participated_in_conflicts, American Civil War
Robert E. Lee, military.military_commander.military_commands, m.049y3bl
Roger Atkinson Pryor, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, time.event.locations, Maryland
James L. Kemper, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam by Thulstrup, common.image.appears_in_topic_gallery, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, William T. Wofford
George T. Anderson, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, base.culturalevent.event.entity_involved, Robert E. Lee
George P. Doles, military.military_person.participated_in_conflicts, Battle of Antietam
Elisha F. Paxton, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Israel B. Richardson
Battle of Antietam, common.topic.article, m.0lkxl
15th Louisiana Infantry Regiment, base.americancivilwar.military_unit.conflicts_participated_in, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, James Henry Lane
Battle of Antietam, military.military_conflict.military_personnel_involved, Edward E. Cross
Joseph Hooker, military.military_person.participated_in_conflicts, American Civil War
George P. Doles, military.military_person.participated_in_conflicts, American Civil War
Crossroads of Freedom: Antietam, The Battle that Changed the Course of the Civil War, book.written_work.subjects, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Robert Ransom, Jr.
Charles Griffin, military.military_person.participated_in_conflicts, American Civil War
Lawrence O'Bryan Branch, military.military_person.participated_in_conflicts, Battle of Antietam
James Henry Lane, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, George Sykes
John Bell Hood, military.military_person.participated_in_conflicts, American Civil War
George Meade, military.military_person.participated_in_conflicts, Battle of Antietam
William Harrow, military.military_person.participated_in_conflicts, Battle of Antietam
Harry T. Hays, military.military_person.participated_in_conflicts, American Civil War
Nathan George Evans, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, George Armstrong Custer
Maxcy Gregg, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Jubal Early
Henry Baxter, 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 Drayton
Ranald S. Mackenzie, military.military_person.participated_in_conflicts, American Civil War
Ambrose Burnside, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Charles Griffin
John Pelham, military.military_person.participated_in_conflicts, Battle of Antietam
Maryland Campaign, military.military_conflict.military_personnel_involved, George B. McClellan
William Barksdale, military.military_person.participated_in_conflicts, Battle of Antietam
William E. Starke, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Francis C. Barlow
Alfred Iverson, Jr., military.military_person.participated_in_conflicts, American Civil War
Winfield S. Featherston, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, George S. Greene
George T. Anderson, military.military_person.participated_in_conflicts, Battle of Antietam
Charles Albright, military.military_person.participated_in_conflicts, American Civil War
Evander M. Law, military.military_person.participated_in_conflicts, Battle of Antietam
Ambrose Burnside, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, John Newton
Maryland, location.location.events, Battle of Antietam
Richard B. Garnett, military.military_person.participated_in_conflicts, Battle of Antietam
George B. McClellan, military.military_person.participated_in_conflicts, Battle of Antietam
Albion P. Howe, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Nelson A. Miles
Jacob Dolson Cox, military.military_person.participated_in_conflicts, Battle of Antietam
Lucius Fairchild, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Daniel Harvey Hill
Elisha F. Paxton, military.military_person.participated_in_conflicts, American Civil War
Sharpsburg, location.location.containedby, Maryland
Battle of Antietam, military.military_conflict.military_personnel_involved, William E. Starke
Battle of Antietam, military.military_conflict.military_personnel_involved, George Meade
Solomon Meredith, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Winfield S. Featherston
Daniel Harvey Hill, 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.commanders, m.049y3bc
American Civil War, base.culturalevent.event.entity_involved, George B. McClellan
Battle of Antietam, military.military_conflict.military_personnel_involved, Roger Atkinson Pryor
Ambrose Burnside, military.military_person.participated_in_conflicts, Maryland Campaign
Truman Seymour, military.military_person.participated_in_conflicts, American Civil War
Israel B. Richardson, military.military_person.participated_in_conflicts, Battle of Antietam
Edward E. Cross, military.military_person.participated_in_conflicts, Battle of Antietam
Maryland Campaign, military.military_conflict.military_personnel_involved, Stonewall Jackson
George S. Greene, military.military_person.participated_in_conflicts, Battle of Antietam
Stonewall Jackson, military.military_person.participated_in_conflicts, Maryland Campaign
Robert Ransom, Jr., military.military_person.participated_in_conflicts, American Civil War
Solomon Meredith, military.military_person.participated_in_conflicts, American Civil War
George Armstrong Custer, military.military_person.participated_in_conflicts, American Civil War
George Meade, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Alfred Iverson, Jr.
James A. Walker, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, location.location.events, Sharpsburg
Nathan George Evans, military.military_person.participated_in_conflicts, Battle of Antietam
Joseph K. Mansfield, military.military_person.participated_in_conflicts, Battle of Antietam
Nelson A. Miles, military.military_person.participated_in_conflicts, American Civil War
Benjamin G. Humphreys, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, George B. McClellan
Battle of Antietam, time.event.included_in_event, Maryland Campaign
William Lowther \"Mudwall\" Jackson, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, base.americancivilwar.battle.military_units_involved_in_this_conflict, 2nd Louisiana Infantry Regiment
Battle of Antietam, common.image.appears_in_topic_gallery, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, James L. Kemper
Fitz John Porter, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, John Bell Hood
Battle of Antietam, military.military_conflict.commanders, m.049y3bl
D. Wyatt Aiken, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.military_personnel_involved, Fitz John Porter
Jacob Dolson Cox, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, Albion P. Howe
Battle of Antietam, military.military_conflict.military_personnel_involved, Thomas H. Ruger
Battle of Antietam, base.culturalevent.event.entity_involved, George B. McClellan
Battle of Antietam, common.topic.image, Battle of Antietam
Paul Jones Semmes, military.military_person.participated_in_conflicts, Battle of Antietam
Battle of Antietam, military.military_conflict.combatants, m.049y38h
Battle of Antietam, military.military_conflict.military_personnel_involved, William Farrar Smith
Robert E. Lee, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, military.military_conflict.military_personnel_involved, William Dorsey Pender
Nathan Kimball, military.military_person.participated_in_conflicts, American Civil War
Richard B. Garnett, military.military_person.participated_in_conflicts, American Civil War
Battle of Antietam, common.topic.notable_for, g.12558rr3p
Battle of Antietam, military.military_conflict.military_personnel_involved, Nathan George Evans

Answer: Maryland
Sharpsburg