It has to be 2 lanterns because thats what happened.
Their are no pics of 1 lantern.
Their are no submarines or deeper meaning
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One lit lantern meant the British would march over the Boston Neck, a narrow strip of land and the only road connecting the town to the mainland, which would take a considerable amount of time. Two lit lanterns in the steeple meant the British would take a shortcut by rowing boats across the Charles River into Cambridge, cutting valuable time off their journey. That’s where we get the famous line from Longfellow’s poem, “One if by land, two if by sea.”
When the British Navy put boats in the water on the night of April 18, 1775, the colonists knew which way they intended to leave. By SEA