*The shogunate establishes a network of fire signals located atop mountains, which could be lit to signal Edo in the event of the incursion of a foreign ship into Nagasaki harbor. The system is never used. | *The shogunate establishes a network of fire signals located atop mountains, which could be lit to signal Edo in the event of the incursion of a foreign ship into Nagasaki harbor. The system is never used. |