They heaped branches and light fagots in the hostile mine, set fire to the pile, and blew thick volumes of smoke along the passage with organ-bellows brought from the churches for the purpose.
Many were thus suffocated.

The discomfited besiegers abandoned the mine where they had met with such able countermining, and sunk another shaft, at midnight, in secret, at a long distance from the Tongres gate.

Still towards that point, however, they burrowed in the darkness; guiding themselves to their destination with magnet, plumbline and level, as the mariner crosses the trackless ocean with compass and chart.

They worked their way, unobstructed, till they arrived at their subterranean port, directly beneath the doomed ravelin.

Here they constructed a spacious chamber, supporting it with columns, and making all their architectural arrangements with as much precision and elegance as if their object had been purely esthetic.