S: (n) battle, conflict, fight, engagement (a hostile meeting of opposing military forces in the course of a war) "Grant won a decisive victory in the battle of Chickamauga"; "he lost his romantic ideas about war when he got into a real engagement"
S: (n) war, state of war (a legal state created by a declaration of war and ended by official declaration during which the international rules of war apply) "war was declared in November but actual fighting did not begin until the following spring"
S: (n) war, warfare (an active struggle between competing entities) "a price war"; "a war of wits"; "diplomatic warfare"
S: (n) war (a concerted campaign to end something that is injurious) "the war on poverty"; "the war against crime"