A task force centered on the USS Enterprise left Pearl Harbor in order to deliver twelve Marine Corps F4F aircraft to Wake Island. But for this, the Enterprise would have been at Pearl Harbor on December 7.
The Enterprise would complete that mission on December 4, and then it turned around to return to Pearl Harbor. It would have arrived there on December 6 but for bad weather.
The Enterprise's departure was known to the Japanese, due to reporting from a consulate based intelligence officer they had there. At this time, this meant, due to reassignments and repairs, only one carrier remained in Pearl Harbor.
The Army concluded the Carolina Maneuvers.