1. 
   Herisson
   a barrier of stakes, arranged randomly in the ground to prevent a direct approach from attackers
   Found op http://www.castlexplorer.co.uk/glossary.php
   
   
2. 
   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 op http://www.encyclo.co.uk/webster/H/37
   
   
3. 
   Herisson
   • (n.) A beam or bar armed with iron spikes, and turning on a pivot; -- used to block up a passage.
   Found op http://thinkexist.com/dictionary/meaning/herisson/
   
   
4. 
   herisson
   wooden palisade
   Found op http://www.castles-of-britain.com/glossary.htm
   
   

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