Mural of War (1896), by Gari Melchers
The Battle of Gettysburg, by Thure de Thulstrup.
The percentages of men killed in war in eight tribal societies, and Europe and the U.S. in the 20th century. (Lawrence H. Keeley, archeologist)
The Egyptian siege of Dapur in the 13th century BC, from Ramesseum, Thebes.
Japanese samurai attacking a Mongol ship, 13th century
Finnish soldiers during the Winter War.
American tanks moving in formation during the Gulf War.
Soldiers of the Australian 4th Division equipped for chemical warfare in WWI, Ypres sector, 1917
Global deaths in conflicts since the year 1400.
The Apotheosis of War (1871) by Vasily Vereshchagin
The remains of dead Crow Indians killed and scalped by Sioux c. 1874
Les Grandes Misères de la guerre depict the destruction unleashed on civilians during the Thirty Years' War.
Ruins of Warsaw's Napoleon Square in the aftermath of World War II
The Ottoman campaign for territorial expansion in Europe in 1566
Women and priests retrieve the dead bodies of Swabian soldiers just outside the city gates of Constance after the battle of Schwaderloh. (Luzerner Schilling)
Increasing population and constant warfare among the Maya city-states over resources may have contributed to the eventual collapse of the Maya civilization by AD 900.
Kuwaiti oil wells on fire, during the Gulf War, 1 March 1991
U.S. Marine helicopter on patrol in Somalia as part of the Unified Task Force, 1992
Median age by country. War reduces life expectancy. A youth bulge is evident for Africa, and to a lesser extent in some countries in West Asia, South Asia, Southeast Asia and Central America.
U.S. soldiers directing artillery on enemy trucks in A Shau Valley, April 1968
U.S. Marines direct a concentration of fire at their opponents, Vietnam, 8 May 1968
Morning after the Battle of Waterloo, by John Heaviside Clark, 1816
In besieged Leningrad. "Hitler ordered that Moscow and Leningrad were to be razed to the ground; their inhabitants were to be annihilated or driven out by starvation. These intentions were part of the 'General Plan East'." – The Oxford Companion to World War II.
Anti-war rally in Washington, D.C., 15 March 2003

In times of war, belligerent countries can be contrasted with neutral countries and non-belligerents.

- Belligerent

Asymmetric warfare is a conflict between belligerents of drastically different levels of military capability or size.

- War
Mural of War (1896), by Gari Melchers

1 related topic

Alpha

The First Geneva Convention governing the sick and wounded members of armed forces was signed in 1864.

Law of war

The First Geneva Convention governing the sick and wounded members of armed forces was signed in 1864.
The signing of the First Geneva Convention by some of the major European powers in 1864.
1904 article outlining the basic principles of the law of war, as published in the Tacoma Times.
The emblem of the International Committee of the Red Cross (French: Comité international de la croix-rouge).

The law of war is the component of international law that regulates the conditions for initiating war (jus ad bellum) and the conduct of warring parties (jus in bello).

Distinction is a principle under international humanitarian law governing the legal use of force in an armed conflict, whereby belligerents must distinguish between combatants and civilians.