How To Use Impregnability In A Sentence

• It was the enemys boast of impregnability that caused their own defeat.
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• From the citadel the impregnability of Ani's site is even more striking: on a peninsula at the confluence of two rivers, only one side of the city was accessible by land.
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• This was an octagonal construction that from a distance seemed a tetragon (a perfect form, which expresses the sturdiness and impregnability of the City of God), whose southern sides stood on the plateau of the abbey, while the northern ones seemed to grow from the steep side of the mountain, a sheer drop, to which they were bound. The Name of the Rose
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