This is a list of orders of battle, which list the known military units that were located within the field of operations for a battle or campaign. The battles are listed in chronological order by starting date (or planned start date). Classical period Early modern period 1792–1860 American Civil War 1866–1913 World War I Inter-war period World War II Modern era Others See also References External links World History Database, Alphabetic Listing of Battles Index of World battles. Radford, Robert, Great Historical Battles. An extensive list of important battles and influential leaders, from −490 BC to present times. Lists of battles Military lists History-related lists 21st-century military history