No feudal lord ever possessed a more formidable fortress.

The town's strategic location has led to it being repeatedly contested and prompted the construction of a formidable fortress.

But two formidable fortresses stand in the way.

For creatures desiring to eat the conch, that is a formidable fortress to breach.

After an official military welcome, we march into the walled court of this formidable fortress.

Would they be able to storm their formidable fortresses?

The Pellinites were short of men and unprepared, but they had the security of a formidable fortress.

Providing themselves with arms, ammunition and food, the Spaniards turned the church into a formidable fortress.

For all its open spaces and free access, Ayodhya was nevertheless a formidable fortress designed to withstand any violent assault, large or small.

The grounded battleship was a formidable fortress indeed.