War

"I wonder why humans continue to fight, I wonder if warriors will ever disappear from this world. Never. There will always be warriors. And there will always be war."

- Cortana

War is any protracted, large-scale, violent conflict; containing several battles. By extension, the word can be used for any long-term struggle. A group of combatants and their support is called an army on land, a navy at sea or in space, and air force in the air. Wars may be prosecuted simultaneously in one or more different theaters. Within each theater, there may be one or more consecutive military campaigns. A military campaign includes not only fighting but also intelligence, troop movements, supplies, propaganda, and other components. A smaller continuous conflict is traditionally called a battle, although this terminology is not always applied to conflicts involving aircraft, missiles or bombs alone, in the absence of ground troops or naval forces.

List of wars

 * Forerunner-Precursor war (c. 10,000,000 BCE)
 * Human-Forerunner wars (c. 107,445 BCE–106,445 BCE)
 * Forerunner-Flood war (c. 97,745 BCE–97,445 BCE)
 * San'Shyuum Schism (2200 BCE–2100 BCE)
 * War of Beginnings (938 BCE–852 BCE)
 * Taming of the Lekgolo (789 BCE–784 BCE)
 * World War I (1914-1918)
 * World War II (1939–1945)
 * Jovian Moons Campaign (2160)
 * Rainforest Wars (2162)
 * Mars Campaign (2163)
 * Interplanetary War (2164–2170)
 * Inner Colony Wars (?)
 * Unggoy Rebellion (2462)
 * Insurrection (2494–2537, 2553–)
 * Human-Covenant War (2525–2553)
 * Great Schism (2552–2552)
 * Sangheili-Jiralhanae war‎ (2552–)
 * Blooding Years (2553–2558)