| Clue | Source | Date |
|---|---|---|
| Series of stakes used as a defensive measure in a morass or river | The Telegraph General Knowledge | 07 Mar 2021 |
| Defensive stakes in a morass or river | The Telegraph General Knowledge | 24 Sep 2017 |
| Dike for defense. | ||
| Defensive work of stakes. | ||
| Military dike of stakes in water. | ||
| Military dike. |