Skynet becomes self-aware
Terminator: The Skynet Funding Bill is passed. The system goes online on August 4th, 1997. Human decisions are removed from strategic defense. Skynet begins to learn at a geometric rate. It becomes self-aware at 2:14 AM, Eastern time, August 29th. In a panic, they try to pull the plug.
Sarah: Skynet fights back.
Context: The Terminator tells Sarah how the military computer Skynet comes to start a nuclear war.
Not in a duel yet