The Great Hedge of India

In the 1840s the British built a custums barrier across India to facilitate collecting the heavy salt tax that ran nearly 2,000 miles (3,200 km), manned by 12,000 personnel. The barrier consisted of fences, stone walls, and a nearly impenetrable barrier of trees, thorny bushes, and hedges, with periodic guard stations.  Im curious to find a way into telling this story.