Related Clues:
- Water-filled ditch around stronghold
- Small tower (on castle, etc)
- Trench around castle
- Trench around building
- Water round a castle
- Zoo's fence alternative
- Castle obstacle
- Castle-circling ditch
- Tower atop a castle
- Protective zoo feature
- Small tower on a castle
- Zoo protection
- Defensive excavation
- Defense against a siege
- Structure on a tank