Archer's stake
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An archer's stake was an anti-cavalry defence used by longbowmen in the 15th and 16th centuries.
At the Battle of Nicopolis in 1396 Turkish archers were stationed behind a barrier of stakes. This may have inspired Henry V when he instructed his men to provide themselves with six foot stakes, which were to be planted in front of them at an angle to impale horses of attacking French men-at-arms prior to the Battle of Agincourt, in 1415.[1]