What was Themistocles's plan in the Battle of Salamis?

He persuaded the Persians to send a third of the fleet to cover the back entrance to the strait and so miss the battle.

He put in the Persian mind the idea that part of the Greek fleet would defect to the Persians as had happened in Ionia nearly twenty years earlier.

He induced the Persian fleet to sit all night at their oars so that they were tired for the battle the following day.

He induced the Persian fleet to attack into the strait where they had to split into two colums to get around an island.

The Greeks then descended on this badly reduced, split ad disorganised enemy.