Sentence examples for allegedly impregnable from inspiring English sources

German capture of the most elaborate and allegedly impregnable of the Belgian forts, Eben Emael, in a matter of hours in the first two days of the campaign against France and the Low Countries in 1940 startled the world.

By an exercise of brilliant psychological deception, and a secretive night march covering nearly 40 miles in 18 hours, the Allies penetrated the allegedly impregnable lines without losing a single man; Marlborough was now in position to besiege the fortress of Bouchain.

An impregnable assertion.

Is that defence impregnable?

The enigma seems impregnable.

"Bell Canada is impregnable".

No system, however, is impregnable.

The double bill looked impregnable.

The horn playing was impregnable.

To many, Google appears impregnable.

"Impregnable" was an autoantonym, too.