This is a sort of organic integrity of affection, which is to those who receive it a tower of strength, that is impregnable to all assault except that of death itself.

Such a nation would be sane and prosperous in time of peace, and absolutely safe and impregnable in the hour of danger.

At last he found himself besieged in his island castle, impregnable against assault, but short of provisions.

Having a base of seventy feet square, and consisting of walls twelve feet thick and one hundred and twenty feet high, it still seems what in fact it was, almost impregnable by any arms but those of the modern world.

General Pacheco completed his teaching at the mouth of the valley where the Carlists had left in a position (impregnable from the front) a strong detachment to withstand the advance of any reinforcements that might be sent from Pampeluna to the relief of Captain Zeneta and his handful of men.

They saw that it was virtually impregnable for any artillery with which they were familiar.

On the highest part of the hill stands the fortress, or stronghold, a place which must have been almost impregnable before the invention of cannon.

It was delightfully situated, on the confines of Europe and Asia, between the Euxine and the Mediterranean, on a narrow peninsula washed by the Sea of Marmora and the beautiful harbor called the Golden Horn, inaccessible from Asia except by water, while it could be made impregnable on the west.

I have discovered and obeyed the will of God revealed in that pebble, it is to me a riddle more insoluble than the Sphinx's, a fortress more impregnable than Sevastopol.

The British Government had decided on making a determined effort to wrest the Colony of New France from the hands of the French, and one of the few steps was to attempt the capture of the port of Louisburg, at the entrance to the Gulf of St. Lawrence; a place which the enemy were said to have rendered almost impregnable at an expenditure of some million and a quarter pounds.

The keepers watched him night and day till a stronger cage was made, impregnable with steel above and rocks below.