Related Clues:
- Castle's perimeter defense
- Zoo landscaping feature
- Ditch under a drawbridge
- Castle security system
- Joust protection
- Fortification ditch
- Strong suit?
- Galahad's strong suit?
- Lancelot's protection
- Water under the bridge?
- Castle's protective device
- Defensive trench
- Means of defense, once
- Jousting gear
- Ring of water