The Dog Line in Eaglehawk Neck, Australia

Savage dogs chained up in a line guarded against prisoners escaping from Port Arthur in the 1800s. The dog line, which ran across the 100-meter-wide "Neck" at Eaglehawk, was devised by John Peyton Jones. Any movement or the slightest noise would set the dogs barking and alert the sentries to ensure that no convicts escaped across the narrow stretch of land that led from the Port Arthur convict settlement further south. The dog line started off with nine dogs, but grew to 18. They were a mixture of breeds, and some reportedly were bloodhounds. Along the ‘dog line’, oil lamps were fixed on posts

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