Iran reportedly informed the Iraqi government of an imminent attack shortly beforehand. The United States Secretary of State Mike Pompeo said the attack was intended to kill, however some analysts suggested the strike was deliberately designed to avoid causing any fatalities in order to dissuade an armed American response
It did exactly that! There were acts of war exchanged by both sides; we're extremely lucky the situation didn't boil over.
Trump accidentally did some harm to the empire, but we were right on the precipice of a war that would have killed (easily) millions.