(1) In the middle of Hue, however, was a virtually impregnable fortress known as the Citadel, with towers, ramparts, moats, concrete walls, and bunkers.

(2) In their accounts of hunting for a way out, they provide a survey of a border territory, an impregnable zone through which the people imprisoned above would never pass.

(3) I'm satisfied this place is nearly impregnable .

(4) Still, to perfect one's play at Worms, you will have to spend a lot of time learning the nuances of each weapon and tricks on how to defeat what seems like an impregnable AI.

(5) He required forceful persuasion to forego county commitments to fly back for the final, but no-one smiled brighter after the previously impregnable Ireland had been clinically defeated by 47 runs.

(6) In the face of these pressures, Anglican natural theology retreated into the apparently impregnable fortress of biology.

(7) Later, he began building model castles, surrounded by fortified emplacements, and he spent hours studying the virtually impregnable fortifications of Vauban.

(8) Incredibly sturdy, it had been built to serve as a nuclear bomb shelter if necessary, supposedly an impregnable fortress of civil defense.

(9) Labyrinthine streets of ancient slum housing traversed the steep hill up to the impregnable city walls.

(10) After all, within the space of a three-month election campaign she managed to squander a seemingly impregnable lead of 22 percent over the SPD.

(11) Then, without warning, you've got the world's number one goalkeeper in self-destruct mode, the England captain glancing an own goal home and a seemingly impregnable lead overturned.

(12) There has to be something; no fortress is completely impregnable .

(13) He's seen what looked like an impregnable 22-point lead slashed to just two ahead of me.

(14) No doubt it will go the way of all seemingly impregnable empires of the past.

(15) But Preston were knocked sideways by the shock of seeing their impregnable lead suddenly wiped out.

(16) But sometime during the final week your impregnable fortress crashes and burns, but you land on your feet at the very end of the month.

(17) Austria ruled directly only in the newly formed Kingdom of Lombardy-Venetia, but from the impregnable fortresses of the Quadrilateral in the central Po Valley Austrian bayonets could reach any part of Italy.

(18) The castle had been built with a good eye for defense; this place was virtually impregnable .

(19) The walls surrounding the city were impregnable , never before breached by an attacking army.

(20) But he had other things in mind - plans that had been consuming his soul since he had escaped from La Fortaleza, the once impregnable fortress that had fallen a little over a year ago.