(n.) Unprovoked attack or act of hostility; the first act of injury\, or first act leading to a war or a controversy; first attack; assault; as, a war of aggression. Aggressions of power.

adventuresomeness adventurousness aggravated assault aggressiveness ambitiousness amphibious attack antagonism armed assault assailing assailment assault attack banzai attack bellicism bellicosity belligerence belligerency blitz blitzkrieg breakthrough charge chauvinism combativeness contentiousness counterattack counteroffensive coup de main crippling attack dead set at descent on diversion diversionary attack drive dynamism encroachment enterprise enterprisingness ferocity fierceness fight flank attack force forcefulness frontal attack gas attack get-up-and-get get-up-and-go getup go go-ahead go-getting go-to-itiveness gumption head-on attack hostility hustle incursion infiltration initiative inroad invasion irruption jingoism lightning attack lightning war martialism mass attack megadeath militancy militarism mugging offense offensive onset onslaught overkill panzer warfare pugnaciousness pugnacity push pushfulness pushiness pushingness quarrelsomeness raid run against run at rush saber rattling sally shock tactics sortie spirit spunk strike truculence unfriendliness unpeacefulness unprovoked assault up-and-comingness venturesomeness venturousness warmongering warpath