1. Major airfields in and around Catania on the east coast were bombed yesterday and today by Flying Fortresses.
2. The taskforce will not only eradicate potential vulnerabilities in its own sensitive computer networks, but also find back doors into the digital fortresses of potential enemies.
3. This could lead some wealthier nations becoming virtual fortresses to preserve their resources.
4. Because of the dangerous terrain, fortresses were important to protect rich families.
5. While small fortresses could only hold several people, more than four large sites could each hold between 400 and 500.