...Harding, Gideon, Spilett, Herbert, Pencroft, and Neb postedthemselves in impregnable line... 
Jules Verne William Henry Giles Kingston 「Abandoned」
... The thorn boma round it wasthe strongest and most impregnable that the Mosula could construct...
Edgar Rice Burroughs 「The Beasts of Tarzan」
...Its tough, armoredhide was impregnable to their knife thrusts while their thrown clubsrattled from it as futilely as if hurled at the rocky shoulder ofPastar-ul-ved...
Edgar Rice Burroughs 「Tarzan the Terrible」
... The place was impregnable unless guns were brought up to theheights...
John Buchan 「Prester John」
...He could not make out how he was caught and checked in every effort, meeting, it seemed, a barrier of iron impregnable in rest...
Anthony Hope 「Rupert of Hentzau」
...Instead of endeavoring to render Paris impregnable, try rather to render the loss of Paris an insignificant matter...
P. J. Proudhon 「What is Property?」
...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」
...On the southern portion of this impregnable site and grouped about apoint where nearly the whole drainage of the mesa top collects, arefound the village remains...
Victor Mindeleff and Cosmos Mindeleff 「A Study of Pueblo Architecture: Tusayan and Cibola」
...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」
..."You know that amphibian city is almost impregnable because humans canhardly live long enough under the water to get into it, let alonefight under water as the frog-men can...
Various 「Astounding Stories of Super-Science, August 1930」
...Saret Balisle seemedto be impregnable...
Arthur J. Burks 「The Mind Master」
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