Mural of War (1896), by Gari Melchers
The Titan II Intercontinental ballistic missile (ICBM) carried a 9 Mt W53 warhead, one of the most powerful nuclear weapons fielded by the United States during the Cold War.
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)
Mushroom cloud from the atomic explosion over Nagasaki rising 18000 m into the air on the morning of August 9, 1945.
The Egyptian siege of Dapur in the 13th century BC, from Ramesseum, Thebes.
A photograph of Sumiteru Taniguchi's back injuries taken in January 1946 by a U.S. Marine photographer
Japanese samurai attacking a Mongol ship, 13th century
J. Robert Oppenheimer.
Finnish soldiers during the Winter War.
Convair B-36 bomber.
American tanks moving in formation during the Gulf War.
American and Soviet nuclear stockpiles.
Soldiers of the Australian 4th Division equipped for chemical warfare in WWI, Ypres sector, 1917
The U.S. and USSR conducted hundreds of nuclear tests, including the Desert Rock exercises at the Nevada Test Site, USA, pictured above during the Korean War to familiarize their soldiers with conducting operations and counter-measures around nuclear detonations, as the Korean War threatened to expand.
Global deaths in conflicts since the year 1400.
More than 100 US-built missiles having the capability to strike Moscow with nuclear warheads were deployed in Italy and Turkey in 1961
The Apotheosis of War (1871) by Vasily Vereshchagin
RF-101 Voodoo reconnaissance photograph of the MRBM launch site in San Cristóbal, Cuba (1962)
The remains of dead Crow Indians killed and scalped by Sioux c. 1874
Montage of the launch of a Trident C4 SLBM and the paths of its reentry vehicles.
Les Grandes Misères de la guerre depict the destruction unleashed on civilians during the Thirty Years' War.
FEMA-estimated primary counterforce targets for Soviet ICBMs in 1990. The resulting fall-out is indicated with the darkest considered as lethal to lesser fall-out yellow zones.
Ruins of Warsaw's Napoleon Square in the aftermath of World War II
Protest against the deployment of Pershing II missiles in Europe, Bonn, West Germany, 1981
The Ottoman campaign for territorial expansion in Europe in 1566
UN vote on adoption of the Treaty on the Prohibition of Nuclear Weapons on 7 July 2017
Women and priests retrieve the dead bodies of Swabian soldiers just outside the city gates of Constance after the battle of Schwaderloh. (Luzerner Schilling)
Large stockpile with global range (dark blue), smaller stockpile with global range (medium blue), small stockpile with regional range (light blue).
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

Nuclear warfare, also known as atomic warfare, is a theoretical military conflict or prepared political strategy that deploys nuclear weaponry.

- Nuclear warfare

Mao Zedong urged the socialist camp not to fear nuclear war with the United States since, even if "half of mankind died, the other half would remain while imperialism would be razed to the ground and the whole world would become socialist."

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

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Mural of War (1896), by Gari Melchers

Conventional warfare

Mural of War (1896), by Gari Melchers

Conventional warfare is a form of warfare conducted by using conventional weapons and battlefield tactics between two or more states in open confrontation.

Nuclear warfare has only occurred once with the United States bombing the Japanese cities of Hiroshima and Nagasaki in August 1945.