The fall of the fortress that had been considered impregnable sparked panic all over the country.

The capital was considered impregnable, for art had supplemented nature in its defense.

Long considered impregnable, none of our people have ever broken in or out and lived to tell of it.

When the defenses were finished in 1756, the city was considered impregnable.

At the siege, the king took an arrow to his hauberk, but the castle, considered impregnable, fell after two years.

Gehrig's legendary consecutive-games record of 2,130, once considered impregnable, now looks extremely vulnerable.

The fortress of Taillebourg was well defended and was considered impregnable.

When conceived in the 1870s the fortifications were considered impregnable.

The Chittorgarh fort was till then considered impregnable and grand, atop a natural hill.

Before the advent of artillery, Hume castle was considered almost impregnable.