| 2026-06-02 | What a drawbridge might cross |
| 2025-09-22 | Castle defense |
| 2025-05-13 | Castle defense |
| 2024-10-28 | Obstacle for a would-be castle attacker |
| 2024-02-07 | Defense from some attackers |
| 2023-12-21 | Water under the drawbridge |
| 2023-11-03 | Tower of London feature |
| 2023-09-25 | Medieval castle defense |
| 2023-09-20 | Castle defense |
| 2023-06-27 | What a drawbridge may cross |
| 2023-04-17 | Castle protector |
| 2023-03-15 | Barrier in certain zoo enclosures |
| 2023-02-08 | Water repellent? |
| 2022-11-17 | Aquatic protection |
| 2022-08-28 | Guard seen around a castle |
| 2021-08-22 | What a drawbridge may bridge |
| 2021-05-10 | Protective trench |
| 2021-05-03 | Means of defense that doesn't actually have alligators |
| 2021-03-26 | Water under the bridge? |
| 2020-09-20 | Castle defense |
| 2020-07-31 | Feature of Tokyo's Imperial Palace |
| 2018-08-18 | Defensive ring |
| 2017-02-10 | Certain barrier to entry |
| 2016-08-26 | It's water under the bridge |
| 2016-04-02 | Certain siege defense |
| 2016-04-01 | Feature of a modern zoo |
| 2016-03-15 | Ring around a castle |
| 2016-02-21 | Feature of the Tokyo Imperial Palace |
| 2015-12-06 | Defensive ring |
| 2015-10-04 | Drawbridge locale |
| 2015-01-30 | Water under the bridge? |
| 2014-11-25 | Castle defense |
| 2014-06-10 | Castle protection |
| 2012-11-11 | Defense against a siege |
| 2012-06-16 | Protective zoo feature |
| 2012-05-15 | Castle obstacle |
| 2011-11-27 | Castle guard |
| 2011-09-18 | Advanced sandcastle feature |
| 2009-10-18 | Castle security system |
| 2009-06-09 | Zoo barrier |
| 2008-02-05 | Castle defense |
| 2008-01-15 | Castle protector |
| 2006-03-14 | Castle defense |
| 2005-11-07 | Castle protector |
| 2005-03-01 | A drawbridge may span one |
| 2004-04-05 | Castle encircler |
| 2004-01-12 | Palace protector |
| 2003-07-08 | Castle defense |
| 2003-03-05 | A drawbridge spans it |
| 2001-03-22 | Alternative to a fence |
| 2000-09-20 | Attack deterrent |
| 2000-01-05 | Zoo barrier |
| 1999-08-01 | Water under the bridge |
| 1998-12-04 | Tower of London feature |
| 1998-11-02 | Castle protection |
| 1998-09-07 | Castle defense |
| 1998-06-20 | Part of a defense |
| 1998-06-01 | Castle protector |
| 1997-07-27 | Water ring |
| 1997-03-17 | Castle's protection |
| 1997-02-28 | Stage protection |
| 1996-10-06 | It may hold the fort |
| 1996-05-16 | Fortress surrounder |
| 1996-02-13 | Castle defense |
| 1995-04-16 | Keep guard |
| 1995-04-11 | Ring of water |
| 1994-09-18 | Ring around the castle |
| 1994-06-03 | Defense mechanism |
| 1994-03-25 | Onetime means of defense |