Related Clues:
- That'll cause trouble enough to spoil 27 across
- That could be a long-term investment
- Make an investment that's offensive
- Six in Ireland capture one, for example for the blockade
- You're being attacked while under it
- "Dog Day Afternoon" event
- Its happy ending comes as a relief
- Burst of activity to achieve an end
- Sustained bombing as in WWII
- Bombardment
- Offensive encirclement
- Intensive attack
- Sustained bombing attack
- Operation to capture a fort, for example
- Offence in which fortified place is surrounded