The Britannica Dictionary defines war as a state of conflict or competition between countries, groups, or individuals.

Apr 14, 2026 · War, in the popular sense, a conflict between political groups involving hostilities of considerable duration and magnitude. Sociologists usually apply the term to such conflicts only if …

6 days ago · War crime, in international law, a serious violation of the laws and customs of war. The term war crime has been difficult to define with precision, and its usage has evolved constantly, …

Mar 25, 2026 · Nuremberg trials, a series of trials held in Nuremberg, Germany, in 1945–46, in which former Nazi leaders were indicted and tried as war criminals by the International Military Tribunal. …

Apr 15, 2026 · The War Powers Act is a law passed by the U.S. Congress on November 7, 1973, over the veto of President Richard Nixon. It sought to restrain the president’s ability to commit U.S. forces …

Feb 28, 2026 · Guerrilla warfare, type of warfare fought by irregulars in fast-moving, small-scale actions against orthodox military and police forces and, on occasion, against rival insurgent forces, either …

Apr 15, 2026 · The Vietnam War (1954–75) was a conflict that pitted the communist government of North Vietnam and its allies in South Vietnam, the Viet Cong, against South Vietnam and its principal …

Apr 1, 2026 · Six-Day War is a brief Arab-Israeli war that took place June 5–10, 1967. After months of escalation, Israel conducted a preemptive air assault demobilizing its neighbors’ air force capabilities, …

Reparations, a levy on a defeated country forcing it to pay some of the war costs of the winners. The most prominent example is the reparations levied on Germany after World War I to compensate the …

War Communism, in the history of the Soviet Union, economic policy applied by the Bolsheviks during the period of the Russian Civil War (1918–20). More exactly, the policy of War Communism lasted …