What system did paul Revere set up to signal that the British were coming?

Paul Revere arranged to have a signal lit in the Old North Church – one lantern if the British were coming by land and two lanterns if they were coming by sea – and began to make preparations for his ride to alert the local militias and citizens about the impending attack. “One if by land, and two if by sea.”

Explanation:

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i think that it would be tenth of the first