Which conflict was the longest in terms of number of years?
Early Muslim conquests
American Civil War
American Civil War
The American Civil War
The American Civil War
War of 1812
The American Civil War
War of 1812
American Civil War
Civil War
The Civil War
War of the Spanish Succession
The American Civil War
War of the Austrian Succession
War of 1812
The War of 1812
Anglo-Boer War
Civil War
The American Civil War
Anglo-American War of 1812
War of 1812
War of the Austrian Succession
American Civil War
War of the Spanish Succession
The War of 1812
War of the Polish Succession
Anglo-American War of Independence
The American Civil War
The Civil War
War of 1812
Civil War
American Civil War, American Civil War
War of the Austrian Succession
Anglo-American Civil War
Anglo-American War of 1812
Anglo-Boer War
War of 1812, American Civil War
Thirty Years' War
Civil War
The American Civil War
Reconquista
War of the Spanish Succession
War of 1812
Anglo-American War of Independence
Anglo-Irish War
War of the Polish Succession
War of the Austrian Succession
Anglo-American War of 1812
The Vietnam War
American Civil War
Anglo-Boer War
War of 1812, American Civil War
Civil War
War in Afghanistan
The American Civil War
Reconquista
War of 1812
War of Independence
War of 1812, Civil War
War of the Spanish Succession
Anglo-American War of Independence
The Civil War
Anglo-American Civil War
The Great War
Thirty Years' War
War of the Austrian Succession
Anglo-American War of 1812
Civil War
American Civil War, American Civil War
War in Afghanistan
American Civil War, Civil War
Lebanese Civil War
Anglo-Boer War
The American Civil War
War of Independence
Reconquista
War of 1812
Anglo-American War
War of 1812, American Civil War
Anglo-Irish War
Russo-Persian War
Anglo-Spanish War
American Civil War, American Revolutionary War
War of the Pacific
The Vietnam War
Anglo-American War of Independence
Anglo-American Civil War
American Civil War
Civil War
Thirty Years' War
War of the Austrian Succession
Anglo-American War of 1812
War of the Polish Succession
War in Afghanistan
War of the Spanish Succession
Crimean War
The American Revolutionary War
War of Independence
The American Civil War
War of 1812, Civil War
Reconquista
War of 1812
Anglo-Boer War
War of the Pacific
Civil War
Russo-Persian War
Anglo-American War
Anglo-American War of Independence
Anglo-Irish War
The Civil War
Thirty Years War
War of 1812, American Civil War
Anglo-American Civil War
War in Afghanistan
War of the Spanish Succession
War of Independence
American Civil War, Civil War
American Civil War
The American Civil War
Reconquista
War of 1812
Civil War
The War of Independence
Anglo-American War of 1812
The Vietnam War
War of the Pacific
The American Revolutionary War
Anglo-Burmese War
Anglo-American War
Thirty Years' War
War in Afghanistan
Crimean War
Anglo-Irish War
Anglo-American Civil War
Anglo-Boer War
Russo-Persian War
War of Independence
Civil War
Anglo-American War of Independence
The Mexican Revolution
The American Civil War
Reconquista
Anglo-Spanish War
War of 1812
War of the Polish Succession
Anglo-Iraq War
War of the Pacific
War of the Spanish Succession
The War of Independence
Thirty Years War
Anglo-American War
American Civil War
War of the Austrian Succession
The Civil War
Lebanese civil war
Civil War
War of Independence
War in Afghanistan
Anglo-Irish War
Russo-German War
Anglo-American Civil War
War of Liberation
The American Civil War
Reconquista
The Vietnam War
War of 1812
Russo-Persian War
The Mexican Revolution
War of the Pacific
Anglo-American War
Anglo-Iraq War
Crimean War
First Indochina War
Civil War
Thirty Years War
War of Independence
War in Afghanistan
The American Revolutionary War and Civil War
War of 1812 – Civil War
Anglo-Ashanti War
The American Revolutionary War, Civil War
War of Liberation
The American Civil War
Anglo-Spanish War
Reconquista
American Civil War
War of 1812
War of the Pacific
Anglo-Boer War
Civil War
Lebanese Civil war
Anglo-American War of Independence
Anglo-Irish War
The Civil War
Anglo-Iraq War
War of Independence
Russo-Persian War
The Mexican Revolution
Anglo-American War of 1812
Russian-Chinese War
The American Revolutionary War