An unprovoked act.

No Roman pilum was thrown in an unprovoked act of aggression, nor any tribe's land laid waste.

The war in 1967 was an unprovoked act of aggression aimed at expanding the boundaries of Israel, and the territories captured during this war are illegally occupied.

Mr. James characterized the attack as an "unprovoked, savage and uncivilized act that will not be tolerated in the city of Newark."

On Sept. 11, 2001, New York City, the most diverse city in the world, was viciously attacked in an unprovoked act of war.

Harrelson even assailed the United States' food-drop/military campaign in Afghanistan as an unprovoked act of aggression.

The number of unprovoked violent acts committed by the PSP was extremely high and frequent.

A meeting of the Non-Aligned Movement said that it condemned the "dastardly, blatant and unprovoked act of aggression".

What happened today was an escalation, rather than an entirely unprovoked act.

In 1863, Union soldiers stationed in the area of Page's home, broke into his laboratory as a random, unprovoked act of violence.