War

''Conflict Zone''}}

2500 BCE
Medieval warfare: Battle of Hastings, 1066
Early modern warfare: Retreat from Moscow, 1812
Industrial age warfare: Battle of the Somme, 1916
Modern warfare: Normandy landings, 1944
Nuclear warfare: Atomic bombing of Nagasaki, 1945}}

War is an armed conflict}} between the armed forces of states, or between governmental forces and armed groups that are organized under a certain command structure and have the capacity to sustain military operations, or between such organized groups. It is generally characterized by widespread violence, destruction, and mortality, using regular or irregular military forces. ''Warfare'' refers to the common activities and characteristics of types of war, or of wars in general. Total war is warfare that is not restricted to purely legitimate military targets, and can result in massive civilian or other non-combatant suffering and casualties.

While some war studies scholars consider war a universal and ancestral aspect of human nature, others argue it is a result of specific socio-cultural, economic, or ecological circumstances. Provided by Wikipedia