...Harding, Gideon, Spilett, Herbert, Pencroft, and Neb postedthemselves in impregnable line... 
Jules Verne William Henry Giles Kingston 「Abandoned」
...“Belle-Isle is impregnable...
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...I, for instance, am proud; that is to say, impregnable...
Alexandre Dumas, Pere 「Ten Years Later」
... The place was impregnable unless guns were brought up to theheights...
John Buchan 「Prester John」
...Thesituation was almost impregnable, being everywhere surroundedwith high precipices, except on the eastern side, where thenatives had left a pathway sufficient to allow one person at atime to ascend...
Mungo Park 「Travels in the Interior of Africa, Vol. 2 [of 2]」
...Instead of endeavoring to render Paris impregnable, try rather to render the loss of Paris an insignificant matter...
P. J. Proudhon 「What is Property?」
...If they wish the trade to continue, let it bebased on the impregnable ground that the merchants want the money,and not on a fantastic dream that is too silly to deceive even achild that knows birds...
William T. Hornaday 「Our Vanishing Wild Life」
...The enemy will succeed in penetrating the impregnable fortress; each foe has his special tactics, contrived with appalling skill...
J. Henri Fabre Alexander Teixeira de Mattos 「The Mason-bees」
...To resist the rigours of the winter, this surface must be impregnable...
J. Henri Fabre 「Bramble-bees and Others」
...Its rocks and caverns seem to have proved as impregnable a garrison to them as to the British...
Samuel Griswold Goodrich 「Illustrative Anecdotes of the Animal Kingdom」
...The city was built at the foot of a natural rock which rises precipitously from the plain, and must have formed an impregnable stronghold against the attack of the foe...
L.W. King and H.R. Hall 「History Of Egypt, Chaldæa, Syria, Babylonia, And Assyria In The Light Of Recent Discovery」
...The builders evidently placed the greatestreliance on their impregnable site, and freely adopted such arrangementas convenience dictated...
Victor Mindeleff and Cosmos Mindeleff 「A Study of Pueblo Architecture: Tusayan and Cibola」
...Edessa was from its position a fortressof the first rank and reputed impregnable...
Various 「The American Journal of Archaeology, 1893-1」
...With such a defensethe Capitol and its grounds seemed impregnable...
Various 「Astounding Stories, June, 1931」
...Saret Balisle seemedto be impregnable...
Arthur J. Burks 「The Mind Master」
...This ancient and impregnable fact has been ignored...
Dr. D.M. Brooks 「The Necessity of Atheism」
...Those equipped with ladders of science have so often scaled thewalls which surround cities of ignorance that they march forward in thesure faith that none of Nature's battlements are impregnable...
Dr. D.M. Brooks 「The Necessity of Atheism」
...Blessed are they that judge this impregnable Cause, thisglorious Announcement, with fairness and equity...
Bahá’u’lláh 「Tablets of Bahá’u’lláh Revealed after the Kitab-i-Aqdas」
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