Aggression

Ag*gres"sion, n. [L. aggressio, fr. aggredi: cf. F. agression.]

Defn: The first attack, or act of hostility; the first act of injury, or first act leading to a war or a controversy; unprovoked attack; assault; as, a war of aggression. "Aggressions of power." Hallam

Syn. -- Attack; offense; intrusion; provocation.