Oh, well I'm glad you spoke up so I could tell you. Back at the beginning of the American Revolution, the patriots were watching for the 'red coats' to come. The plan was to warn people of the enemy's approach toward Concord by leaving a lit candle in the window / steeple of the church. The Old North church, which still stands today in Boston, Massachusetts. There would be 1 candle lit if they were coming by land and 2 candles lit if they were coming by sea.

So glad to be able to inform you about that, fren.