Herisson

a barrier of stakes, arranged randomly in the ground to prevent a direct approach from attackers
Found on http://www.castlexplorer.co.uk/glossary.php

Herisson

Her'is·son noun [ French hérisson , prop., hedgehog.] (fort.) A beam or bar armed with iron spikes, and turning on a pivot; -- used to block up a passage.
Found on http://www.encyclo.co.uk/webster/H/37

Herisson

• (n.) A beam or bar armed with iron spikes, and turning on a pivot; -- used to block up a passage.
Found on http://thinkexist.com/dictionary/meaning/herisson/

herisson

wooden palisade
Found on http://www.castles-of-britain.com/glossary.htm

Herisson

a barrier of stakes, arranged randomly in the ground to prevent a direct approach from attackers
Found on http://www.castlexplorer.co.uk/glossary.php

herisson

swinging beam bearing iron spikes
Found on http://phrontistery.info/h.html
No exact match found