I've just read the history of the Battle of Lexington and Concord. The lanterns were signals letting the militiamen know how the British (the Enemy) was coming - 1 lantern by land and 2 lanterns by sea.
I haven't seen anywhere where that has been understood.
I believe Q's post is telling us that an enemy force is coming by sea or that an enemy force has been vanquished at sea.
Then the most recent tweet shows some sort of statue in front of two lights at the top of a tower. The tweet also includes a tweet from an independent journalist insinuating that General Flynn will be exonerated.
Could it also mean that this will be the trigger point for the 'enemy' to make their move by sea?
Could it be the Chinese Navy who are off the coast of California?
Just wondering out loud.