تحفة النظار في غرايب الامصار وعجايب الاسفار 13.24.3

13.24.3

The infidels in the land of Hind live in a continuous territory and in lands contiguous with the Muslims, and the Muslims have the upper hand over them. The infidels only hold out in the mountains and rugged places. They have thickets of cane; their cane is not hollow, it grows large, and it is intertwined, fire has no effect on it, and it is very strong. They live in those thickets, which serve them as a wall, and inside them are their livestock and crops, and they have water there from what collects of the rainwater. So they can only be overcome by strong armies of men who enter those thickets and cut down the cane with tools prepared for that purpose.