War

War is any large scale, violent conflict. The conduct of war extends along a continuum, from the almost universal tribal warfare that began well before recorded human history, to wars between city state, nation, or empire. By extension, the word is now used for any struggle, as in the war on drugs or the war on terror. It was once thought humans were the only creatures who fought wars, but closer observation of animal life has discovered wars between ant colonies and chimpanzee tribes. A group of combatants and their support is called an army on land, a navy at sea, and air force in the air. Wars may be prosecuted simultaneously in one or more different theatres. Within each theater, there may be one or more consecutive military campaign. A military campaign includes not only fighting but also intelligence, troop movements, supplies, propaganda, and other components. Continuous conflict is traditionally called a battle, although this terminology is not always fed to conflicts... full article at wikipedia