At this point it was enlarged from the old road to its present width by cutting into the solid bastion of the rock on the far side of the gorge; and its left or western edge, looking down from the pass and the bridge, was marked and protected by a line of upright cut blocks of stone where its edge fell sheer away to the gorge.
There are no more uses of "bastion" in the book.
Show samples from other sources
These rules are a bastion against corruption.
The universities were the last bastion of freedom, but they were purged of anyone who questioned official propaganda shortly after the coup.