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Webster 1913 Edition

Noun.

[F., fr.

herse

a harrow. See

Noun.

]

(Fort.)

A beam with projecting spikes, used to make a breach impassable.

Noun.

[from herse.] In the military art, a plank or beam, whose sides are set with spikes or nails, to incommode and retard the march of an enemy.

hersillon ‎(plural hersillons)

(fortification) A beam with projecting spikes, used to make a breach impassable.