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Furnished with a bastion; having bastions. quotations examples
As he walked stiffly aslant against the booming northern wind, he tried to marshal his thoughts, tried to dovetail for himself a picture of what had happened behind the grim, bastioned walls of the lamasery and of what was going to happen […]
1919, Achmed Abdullah, chapter IV, in Fear and Other Stories
To the North there were low pale-colored hills, in places bastioned with rock.
1953, C. S. Lewis, chapter 5, in The Silver Chair, Collins, published 1998
simple past and past participle of bastion examples